Add WooCommerce integration for payments, invoices, and order management (v0.11.0)

- Product sync: Virtual WC products for rooms with bidirectional linking
- Cart/Checkout: Booking data in cart items, availability validation, dynamic pricing
- Orders: Automatic booking creation on payment, status mapping, guest record creation
- Invoices: PDF generation via mPDF, auto-attach to emails, configurable numbering
- Refunds: Full refund cancels booking, partial refund records amount only
- Admin: Cross-linked columns and row actions between bookings and orders
- Settings: WooCommerce tab with subtabs (General, Products, Orders, Invoices)
- HPOS compatibility declared for High-Performance Order Storage

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

CHANGELOG.md

@@ -5,6 +5,76 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.11.0] - 2026-02-03
+
+### Added
+
+- WooCommerce Integration System:
+  - New `src/Integration/WooCommerce/` directory with complete integration
+  - `Manager.php` - Core integration manager with HPOS compatibility declaration
+  - `ProductSync.php` - Room-to-WooCommerce-product synchronization
+  - `CartHandler.php` - Cart item data, availability validation, dynamic pricing
+  - `CheckoutHandler.php` - Checkout field customization and pre-fill
+  - `OrderHandler.php` - Booking creation on payment completion
+  - `InvoiceGenerator.php` - PDF invoice generation using mPDF
+  - `RefundHandler.php` - Booking cancellation on full refund
+  - `AdminColumns.php` - Admin list cross-links between bookings and orders
+- Product Synchronization:
+  - Virtual WooCommerce products created for rooms (SKU: `bnb-room-{id}`)
+  - Auto-sync on room save, delete on room deletion
+  - Manual "Sync All Rooms" button in settings
+  - Bidirectional meta linking (room ↔ product)
+- Cart & Checkout:
+  - Booking data stored in cart items (room, dates, guests, services)
+  - Availability validation before add-to-cart and at checkout
+  - Dynamic price calculation based on dates and services
+  - Cart item display shows booking details (dates, guests, nights)
+  - Special requests and arrival time fields at checkout
+  - Booking summary display in checkout and order received page
+- Order & Booking Integration:
+  - Automatic booking creation on `woocommerce_payment_complete`
+  - Guest record creation from order billing info
+  - Bidirectional order-booking links via meta keys
+  - Status synchronization (WC status → Booking status mapping)
+  - Booking reference generation (BNB-YYYY-NNNNN)
+- Invoice Generation:
+  - PDF invoices using existing mPDF dependency
+  - Invoice numbering with configurable prefix and start number
+  - Auto-attach invoices to WooCommerce order emails
+  - Download invoice button in admin order actions
+  - Secure storage in `wp-content/uploads/wp-bnb-invoices/`
+- Refund Handling:
+  - Full refund triggers booking cancellation
+  - Partial refund stores amount in booking meta without cancellation
+  - Refund info displayed in booking admin
+  - `wp_bnb_wc_should_cancel_on_refund` filter for customization
+- Admin Enhancements:
+  - "WC Order" column in bookings list with order link and status
+  - "Booking" column in WC orders list with dates and status
+  - Row actions for cross-navigation between bookings and orders
+  - HPOS (High-Performance Order Storage) support
+- WooCommerce Settings Tab with Subtabs:
+  - General: Enable integration, auto-confirm on payment, WC status indicator
+  - Products: Auto-sync toggle, product category selection, sync button
+  - Orders: Status mapping reference table
+  - Invoices: Auto-attach, prefix, starting number, logo, footer text
+- Frontend Assets:
+  - `assets/css/wc-integration.css` - Cart, checkout, and booking form styles
+  - `assets/js/wc-integration.js` - Booking form handler, AJAX operations
+
+### Changed
+
+- Plugin.php updated to initialize WooCommerce integration when WC is active
+- Settings page now has eight tabs: General, Pricing, License, Updates, Metrics, API, WooCommerce
+- HPOS compatibility declared via `FeaturesUtil::declare_compatibility()`
+
+### Security
+
+- Invoice storage protected with .htaccess (deny all)
+- Nonce verification on all AJAX operations
+- Capability checks for admin actions
+- HPOS-compatible meta access using `$order->get_meta()` / `$order->update_meta_data()`
+
 ## [0.10.1] - 2026-02-03
 
 ### Added
@@ -634,6 +704,14 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Input sanitization and output escaping
 - Server secret masking in license settings
 
+[0.11.0]: https://src.bundespruefstelle.ch/magdev/wp-bnb/releases/tag/v0.11.0
+[0.10.1]: https://src.bundespruefstelle.ch/magdev/wp-bnb/releases/tag/v0.10.1
+[0.10.0]: https://src.bundespruefstelle.ch/magdev/wp-bnb/releases/tag/v0.10.0
+[0.9.0]: https://src.bundespruefstelle.ch/magdev/wp-bnb/releases/tag/v0.9.0
+[0.8.0]: https://src.bundespruefstelle.ch/magdev/wp-bnb/releases/tag/v0.8.0
+[0.7.2]: https://src.bundespruefstelle.ch/magdev/wp-bnb/releases/tag/v0.7.2
+[0.7.1]: https://src.bundespruefstelle.ch/magdev/wp-bnb/releases/tag/v0.7.1
+[0.7.0]: https://src.bundespruefstelle.ch/magdev/wp-bnb/releases/tag/v0.7.0
 [0.6.1]: https://src.bundespruefstelle.ch/magdev/wp-bnb/releases/tag/v0.6.1
 [0.6.0]: https://src.bundespruefstelle.ch/magdev/wp-bnb/releases/tag/v0.6.0
 [0.5.0]: https://src.bundespruefstelle.ch/magdev/wp-bnb/releases/tag/v0.5.0

PLAN.md

@@ -204,12 +204,12 @@ This document outlines the implementation plan for the WP BnB Management plugin.
 - [x] Transient-based rate limiting with tiered limits
 - [x] API settings tab with enable/disable toggles
 
-### Phase 11: WooCommerce Integration (v0.11.0)
+### Phase 11: WooCommerce Integration (v0.11.0) - Complete
 
-- [ ] Payment processing
+- [x] Payment processing
-- [ ] Invoice generation
+- [x] Invoice generation
-- [ ] Order management
+- [x] Order management
-- [ ] Refund handling
+- [x] Refund handling
 
 ## Phase 12: Security Audit (v0.12.0)
 
@@ -359,6 +359,6 @@ The plugin will provide extensive hooks for customization:
 | 0.8.0   | Dashboard               | Complete |
 | 0.9.0   | Prometheus Metrics      | Complete |
 | 0.10.0  | API Endpoints           | Complete |
-| 0.11.0  | WooCommerce Integration | TBD      |
+| 0.11.0  | WooCommerce Integration | Complete |
 | 0.12.0  | Security Audit          | TBD      |
 | 1.0.0   | Stable Release          | TBD      |

assets/css/admin.css

@@ -598,12 +598,36 @@
 	display: inline-block;
 	padding: 3px 8px;
 	border-radius: 3px;
-	color: #fff;
 	font-size: 12px;
 	font-weight: 600;
 	text-transform: uppercase;
 }
 
+.bnb-status-pending {
+	background: #fff8e5;
+	color: #9d6a00;
+}
+
+.bnb-status-confirmed {
+	background: #e6f4ea;
+	color: #0a6e31;
+}
+
+.bnb-status-checked_in {
+	background: #e3f2fd;
+	color: #1565c0;
+}
+
+.bnb-status-checked_out {
+	background: #f5f5f5;
+	color: #616161;
+}
+
+.bnb-status-cancelled {
+	background: #ffeaea;
+	color: #d63638;
+}
+
 /* Room Details Meta Box */
 #bnb_room_details .form-table td label {
 	display: inline-block;

assets/css/wc-integration.css

@@ -0,0 +1,443 @@
+/**
+ * WooCommerce Integration Styles
+ *
+ * Styles for WP BnB - WooCommerce integration
+ *
+ * @package Magdev\WpBnb
+ */
+
+/* ==========================================================================
+   Cart Item - Booking Data Display
+   ========================================================================== */
+
+.woocommerce-cart .cart_item .bnb-booking-info {
+	margin-top: 8px;
+	padding: 10px;
+	background: #f9f9f9;
+	border-radius: 4px;
+	font-size: 0.9em;
+}
+
+.woocommerce-cart .cart_item .bnb-booking-info dt {
+	display: inline-block;
+	font-weight: 600;
+	min-width: 80px;
+	color: #50575e;
+}
+
+.woocommerce-cart .cart_item .bnb-booking-info dd {
+	display: inline-block;
+	margin: 0 0 4px 0;
+}
+
+/* ==========================================================================
+   Checkout - Booking Summary
+   ========================================================================== */
+
+.bnb-checkout-booking-summary {
+	margin: 20px 0;
+	padding: 15px;
+	background: #f8f9fa;
+	border: 1px solid #e1e4e8;
+	border-radius: 4px;
+}
+
+.bnb-checkout-booking-summary h3 {
+	margin: 0 0 15px 0;
+	padding: 0 0 10px 0;
+	border-bottom: 1px solid #e1e4e8;
+	font-size: 1.1em;
+	color: #2271b1;
+}
+
+.bnb-booking-item {
+	margin-bottom: 12px;
+	padding-bottom: 12px;
+	border-bottom: 1px dashed #e1e4e8;
+}
+
+.bnb-booking-item:last-child {
+	margin-bottom: 0;
+	padding-bottom: 0;
+	border-bottom: none;
+}
+
+.bnb-booking-item strong {
+	display: block;
+	font-size: 1em;
+	color: #1d2327;
+}
+
+.bnb-building-name {
+	display: block;
+	font-size: 0.85em;
+	color: #787c82;
+	margin-top: 2px;
+}
+
+.bnb-booking-details {
+	margin-top: 8px;
+	font-size: 0.9em;
+	color: #50575e;
+}
+
+.bnb-booking-details span {
+	display: inline-block;
+	margin-right: 15px;
+}
+
+.bnb-booking-details span::before {
+	content: "•";
+	margin-right: 5px;
+	color: #c3c4c7;
+}
+
+.bnb-booking-details span:first-child::before {
+	content: "";
+	margin-right: 0;
+}
+
+/* ==========================================================================
+   Thank You Page - Booking Confirmation
+   ========================================================================== */
+
+.woocommerce-booking-confirmation {
+	margin: 30px 0;
+	padding: 20px;
+	background: #f0f8f1;
+	border: 1px solid #d1e7d7;
+	border-radius: 4px;
+}
+
+.woocommerce-booking-confirmation h2 {
+	margin: 0 0 15px 0;
+	color: #00a32a;
+	font-size: 1.3em;
+}
+
+.woocommerce-table--booking-details {
+	width: 100%;
+	margin-bottom: 15px;
+}
+
+.woocommerce-table--booking-details th {
+	text-align: left;
+	width: 40%;
+	padding: 8px 12px 8px 0;
+	color: #50575e;
+	font-weight: 600;
+}
+
+.woocommerce-table--booking-details td {
+	padding: 8px 0;
+}
+
+.woocommerce-table--booking-details small {
+	display: block;
+	color: #787c82;
+	margin-top: 2px;
+}
+
+.woocommerce-booking-reference {
+	margin: 20px 0;
+	padding: 10px 15px;
+	background: #f6f7f7;
+	border-radius: 4px;
+}
+
+.woocommerce-booking-reference .bnb-status-badge {
+	margin-left: 10px;
+}
+
+/* ==========================================================================
+   Status Badges
+   ========================================================================== */
+
+.bnb-status-badge {
+	display: inline-block;
+	padding: 2px 8px;
+	border-radius: 3px;
+	font-size: 11px;
+	font-weight: 600;
+	text-transform: uppercase;
+}
+
+.bnb-status-pending {
+	background: #fff8e5;
+	color: #9d6a00;
+}
+
+.bnb-status-confirmed {
+	background: #e6f4ea;
+	color: #0a6e31;
+}
+
+.bnb-status-checked_in {
+	background: #e3f2fd;
+	color: #1565c0;
+}
+
+.bnb-status-checked_out {
+	background: #f5f5f5;
+	color: #616161;
+}
+
+.bnb-status-cancelled {
+	background: #ffeaea;
+	color: #d63638;
+}
+
+/* ==========================================================================
+   Booking Form (Frontend)
+   ========================================================================== */
+
+.bnb-wc-booking-form {
+	margin: 20px 0;
+	padding: 20px;
+	background: #fff;
+	border: 1px solid #e1e4e8;
+	border-radius: 4px;
+}
+
+.bnb-wc-booking-form h3 {
+	margin: 0 0 20px 0;
+	padding: 0 0 15px 0;
+	border-bottom: 1px solid #e1e4e8;
+}
+
+.bnb-wc-booking-form .form-row {
+	margin-bottom: 15px;
+}
+
+.bnb-wc-booking-form label {
+	display: block;
+	margin-bottom: 5px;
+	font-weight: 600;
+}
+
+.bnb-wc-booking-form input[type="date"],
+.bnb-wc-booking-form input[type="number"],
+.bnb-wc-booking-form select {
+	width: 100%;
+	padding: 10px;
+	border: 1px solid #c3c4c7;
+	border-radius: 4px;
+	font-size: 1em;
+}
+
+.bnb-wc-booking-form input[type="date"]:focus,
+.bnb-wc-booking-form input[type="number"]:focus,
+.bnb-wc-booking-form select:focus {
+	border-color: #2271b1;
+	outline: none;
+	box-shadow: 0 0 0 1px #2271b1;
+}
+
+.bnb-wc-booking-form .form-row-inline {
+	display: flex;
+	gap: 15px;
+}
+
+.bnb-wc-booking-form .form-row-inline > div {
+	flex: 1;
+}
+
+/* Availability status */
+.bnb-availability-status {
+	margin: 15px 0;
+	padding: 10px 15px;
+	border-radius: 4px;
+	display: flex;
+	align-items: center;
+	gap: 8px;
+}
+
+.bnb-availability-status.checking {
+	background: #f6f7f7;
+	color: #787c82;
+}
+
+.bnb-availability-status.available {
+	background: #e6f4ea;
+	color: #0a6e31;
+}
+
+.bnb-availability-status.unavailable {
+	background: #ffeaea;
+	color: #d63638;
+}
+
+.bnb-availability-status .dashicons {
+	font-size: 18px;
+	width: 18px;
+	height: 18px;
+}
+
+/* Price display */
+.bnb-wc-price-display {
+	margin: 15px 0;
+	padding: 15px;
+	background: #f8f9fa;
+	border-radius: 4px;
+}
+
+.bnb-wc-price-display .price-row {
+	display: flex;
+	justify-content: space-between;
+	padding: 5px 0;
+}
+
+.bnb-wc-price-display .price-row.total {
+	border-top: 1px solid #e1e4e8;
+	margin-top: 10px;
+	padding-top: 10px;
+	font-weight: 700;
+	font-size: 1.1em;
+}
+
+/* Services selection */
+.bnb-wc-services {
+	margin: 15px 0;
+}
+
+.bnb-wc-services h4 {
+	margin: 0 0 10px 0;
+	font-size: 1em;
+}
+
+.bnb-wc-service-item {
+	display: flex;
+	align-items: center;
+	padding: 10px;
+	margin-bottom: 8px;
+	background: #f9f9f9;
+	border-radius: 4px;
+	cursor: pointer;
+	transition: background 0.2s;
+}
+
+.bnb-wc-service-item:hover {
+	background: #f0f0f0;
+}
+
+.bnb-wc-service-item.selected {
+	background: #e6f4ea;
+	border: 1px solid #d1e7d7;
+}
+
+.bnb-wc-service-item input[type="checkbox"] {
+	margin-right: 10px;
+}
+
+.bnb-wc-service-item .service-name {
+	flex: 1;
+}
+
+.bnb-wc-service-item .service-price {
+	color: #2271b1;
+	font-weight: 600;
+}
+
+.bnb-wc-service-item .service-qty {
+	margin-left: 10px;
+	width: 60px;
+}
+
+/* Add to cart button */
+.bnb-wc-booking-form .add-to-cart-btn {
+	width: 100%;
+	padding: 12px 20px;
+	background: #2271b1;
+	color: #fff;
+	border: none;
+	border-radius: 4px;
+	font-size: 1.1em;
+	font-weight: 600;
+	cursor: pointer;
+	transition: background 0.2s;
+}
+
+.bnb-wc-booking-form .add-to-cart-btn:hover {
+	background: #135e96;
+}
+
+.bnb-wc-booking-form .add-to-cart-btn:disabled {
+	background: #c3c4c7;
+	cursor: not-allowed;
+}
+
+/* ==========================================================================
+   Admin Order - Booking Info
+   ========================================================================== */
+
+.bnb-order-booking-info {
+	margin-top: 20px;
+	padding: 15px;
+	background: #f6f7f7;
+	border-radius: 4px;
+}
+
+.bnb-order-booking-info h3 {
+	margin: 0 0 12px 0;
+	font-size: 13px;
+	color: #1d2327;
+}
+
+.bnb-order-booking-info p {
+	margin: 0 0 8px 0;
+	font-size: 13px;
+}
+
+.bnb-order-booking-info a {
+	color: #2271b1;
+}
+
+.bnb-order-booking-info a:hover {
+	color: #135e96;
+}
+
+/* ==========================================================================
+   Admin List Table - Order Columns
+   ========================================================================== */
+
+.column-wc_order {
+	width: 10%;
+}
+
+.column-bnb_booking {
+	width: 15%;
+}
+
+.column-bnb_booking small {
+	display: block;
+	color: #787c82;
+	margin-top: 2px;
+}
+
+/* Order action buttons */
+.wc-action-button-view_booking::after {
+	font-family: dashicons;
+	content: "\f513";
+}
+
+/* ==========================================================================
+   Responsive
+   ========================================================================== */
+
+@media screen and (max-width: 768px) {
+	.bnb-wc-booking-form .form-row-inline {
+		flex-direction: column;
+		gap: 0;
+	}
+
+	.bnb-booking-details span {
+		display: block;
+		margin-right: 0;
+		margin-bottom: 4px;
+	}
+
+	.bnb-booking-details span::before {
+		content: "";
+		margin-right: 0;
+	}
+}

assets/js/wc-integration.js

@@ -0,0 +1,358 @@
+/**
+ * WooCommerce Integration Scripts
+ *
+ * Handles booking form interactions for WooCommerce integration.
+ *
+ * @package Magdev\WpBnb
+ */
+
+(function ($) {
+	'use strict';
+
+	/**
+	 * WP BnB WooCommerce Integration
+	 */
+	const WpBnbWC = {
+		/**
+		 * Settings from localization
+		 */
+		settings: {},
+
+		/**
+		 * Initialize
+		 */
+		init: function () {
+			this.settings = window.wpBnbWC || {};
+			this.bindEvents();
+			this.initBookingForms();
+		},
+
+		/**
+		 * Bind global events
+		 */
+		bindEvents: function () {
+			// Admin: Sync all rooms button
+			$(document).on('click', '.bnb-sync-rooms-btn', this.handleSyncRooms.bind(this));
+
+			// Admin: Generate invoice button
+			$(document).on('click', '.bnb-generate-invoice-btn', this.handleGenerateInvoice.bind(this));
+		},
+
+		/**
+		 * Initialize booking forms
+		 */
+		initBookingForms: function () {
+			$('.bnb-wc-booking-form').each(function () {
+				new BookingForm($(this));
+			});
+		},
+
+		/**
+		 * Handle sync all rooms button
+		 */
+		handleSyncRooms: function (e) {
+			e.preventDefault();
+			const $btn = $(e.currentTarget);
+			const $status = $btn.siblings('.sync-status');
+
+			$btn.prop('disabled', true).addClass('updating');
+			$status.text(this.settings.i18n?.syncing || 'Syncing...');
+
+			$.ajax({
+				url: this.settings.ajaxUrl,
+				type: 'POST',
+				data: {
+					action: 'wp_bnb_sync_all_rooms',
+					nonce: this.settings.nonce
+				},
+				success: function (response) {
+					if (response.success) {
+						$status.html('<span class="success">' + response.data.message + '</span>');
+					} else {
+						$status.html('<span class="error">' + (response.data?.message || 'Error') + '</span>');
+					}
+				},
+				error: function () {
+					$status.html('<span class="error">' + (WpBnbWC.settings.i18n?.error || 'Error occurred') + '</span>');
+				},
+				complete: function () {
+					$btn.prop('disabled', false).removeClass('updating');
+				}
+			});
+		},
+
+		/**
+		 * Handle generate invoice button
+		 */
+		handleGenerateInvoice: function (e) {
+			e.preventDefault();
+			const $btn = $(e.currentTarget);
+			const orderId = $btn.data('order-id');
+
+			$btn.prop('disabled', true).addClass('updating');
+
+			$.ajax({
+				url: this.settings.ajaxUrl,
+				type: 'POST',
+				data: {
+					action: 'wp_bnb_generate_invoice',
+					nonce: this.settings.nonce,
+					order_id: orderId
+				},
+				success: function (response) {
+					if (response.success) {
+						location.reload();
+					} else {
+						alert(response.data?.message || 'Error generating invoice');
+					}
+				},
+				error: function () {
+					alert(WpBnbWC.settings.i18n?.error || 'Error occurred');
+				},
+				complete: function () {
+					$btn.prop('disabled', false).removeClass('updating');
+				}
+			});
+		}
+	};
+
+	/**
+	 * Booking Form Handler
+	 */
+	class BookingForm {
+		constructor($form) {
+			this.$form = $form;
+			this.roomId = $form.data('room-id');
+			this.productId = $form.data('product-id');
+			this.checkAvailabilityTimeout = null;
+
+			this.bindEvents();
+		}
+
+		bindEvents() {
+			this.$form.on('change', '.bnb-date-input', this.onDateChange.bind(this));
+			this.$form.on('change', '.bnb-guests-input', this.onGuestsChange.bind(this));
+			this.$form.on('change', '.bnb-service-checkbox', this.onServiceChange.bind(this));
+			this.$form.on('change', '.bnb-service-qty', this.onServiceQtyChange.bind(this));
+			this.$form.on('submit', this.onSubmit.bind(this));
+		}
+
+		onDateChange() {
+			const checkIn = this.$form.find('[name="bnb_check_in"]').val();
+			const checkOut = this.$form.find('[name="bnb_check_out"]').val();
+
+			// Validate dates
+			if (!checkIn || !checkOut) {
+				this.updateAvailabilityStatus('');
+				return;
+			}
+
+			const checkInDate = new Date(checkIn);
+			const checkOutDate = new Date(checkOut);
+			const today = new Date();
+			today.setHours(0, 0, 0, 0);
+
+			if (checkInDate < today) {
+				this.updateAvailabilityStatus('unavailable', WpBnbWC.settings.i18n?.pastDate || 'Check-in cannot be in the past');
+				return;
+			}
+
+			if (checkOutDate <= checkInDate) {
+				this.updateAvailabilityStatus('unavailable', WpBnbWC.settings.i18n?.invalidDates || 'Check-out must be after check-in');
+				return;
+			}
+
+			// Check availability
+			this.checkAvailability(checkIn, checkOut);
+		}
+
+		onGuestsChange() {
+			// Re-validate if needed
+			const checkIn = this.$form.find('[name="bnb_check_in"]').val();
+			const checkOut = this.$form.find('[name="bnb_check_out"]').val();
+
+			if (checkIn && checkOut) {
+				this.checkAvailability(checkIn, checkOut);
+			}
+		}
+
+		onServiceChange(e) {
+			const $checkbox = $(e.currentTarget);
+			const $item = $checkbox.closest('.bnb-wc-service-item');
+			const $qtyInput = $item.find('.bnb-service-qty');
+
+			if ($checkbox.is(':checked')) {
+				$item.addClass('selected');
+				$qtyInput.prop('disabled', false);
+			} else {
+				$item.removeClass('selected');
+				$qtyInput.prop('disabled', true);
+			}
+
+			this.updatePriceDisplay();
+		}
+
+		onServiceQtyChange() {
+			this.updatePriceDisplay();
+		}
+
+		checkAvailability(checkIn, checkOut) {
+			// Debounce
+			clearTimeout(this.checkAvailabilityTimeout);
+
+			this.updateAvailabilityStatus('checking', WpBnbWC.settings.i18n?.checking || 'Checking availability...');
+
+			this.checkAvailabilityTimeout = setTimeout(() => {
+				const guests = this.$form.find('[name="bnb_guests"]').val() || 1;
+
+				$.ajax({
+					url: WpBnbWC.settings.ajaxUrl,
+					type: 'POST',
+					data: {
+						action: 'wp_bnb_get_availability',
+						nonce: WpBnbWC.settings.nonce,
+						room_id: this.roomId,
+						check_in: checkIn,
+						check_out: checkOut,
+						guests: guests
+					},
+					success: (response) => {
+						if (response.success) {
+							const data = response.data;
+
+							if (data.available) {
+								this.updateAvailabilityStatus('available', WpBnbWC.settings.i18n?.available || 'Available');
+								this.updatePriceDisplay(data.price, data.breakdown);
+								this.enableSubmit();
+							} else {
+								this.updateAvailabilityStatus('unavailable', data.message || WpBnbWC.settings.i18n?.unavailable || 'Not available');
+								this.disableSubmit();
+							}
+						} else {
+							this.updateAvailabilityStatus('unavailable', response.data?.message || 'Error checking availability');
+							this.disableSubmit();
+						}
+					},
+					error: () => {
+						this.updateAvailabilityStatus('unavailable', WpBnbWC.settings.i18n?.error || 'Error checking availability');
+						this.disableSubmit();
+					}
+				});
+			}, 500);
+		}
+
+		updateAvailabilityStatus(status, message) {
+			const $statusEl = this.$form.find('.bnb-availability-status');
+
+			if (!status) {
+				$statusEl.hide();
+				return;
+			}
+
+			$statusEl.removeClass('checking available unavailable').addClass(status);
+
+			let icon = '';
+			switch (status) {
+				case 'checking':
+					icon = '<span class="dashicons dashicons-update"></span>';
+					break;
+				case 'available':
+					icon = '<span class="dashicons dashicons-yes-alt"></span>';
+					break;
+				case 'unavailable':
+					icon = '<span class="dashicons dashicons-no-alt"></span>';
+					break;
+			}
+
+			$statusEl.html(icon + ' ' + message).show();
+		}
+
+		updatePriceDisplay(roomPrice, breakdown) {
+			const $priceDisplay = this.$form.find('.bnb-wc-price-display');
+
+			if (!roomPrice) {
+				$priceDisplay.hide();
+				return;
+			}
+
+			// Calculate services total
+			let servicesTotal = 0;
+			const nights = breakdown?.nights || 1;
+
+			this.$form.find('.bnb-wc-service-item').each(function () {
+				const $item = $(this);
+				const $checkbox = $item.find('.bnb-service-checkbox');
+
+				if ($checkbox.is(':checked')) {
+					const price = parseFloat($item.data('price')) || 0;
+					const pricingType = $item.data('pricing-type');
+					const qty = parseInt($item.find('.bnb-service-qty').val()) || 1;
+
+					if (pricingType === 'per_night') {
+						servicesTotal += price * qty * nights;
+					} else if (pricingType === 'per_booking') {
+						servicesTotal += price * qty;
+					}
+				}
+			});
+
+			const grandTotal = roomPrice + servicesTotal;
+
+			// Update display
+			let html = '<div class="price-row"><span>' + (WpBnbWC.settings.i18n?.roomTotal || 'Room') + '</span><span>' + WpBnbWC.formatPrice(roomPrice) + '</span></div>';
+
+			if (servicesTotal > 0) {
+				html += '<div class="price-row"><span>' + (WpBnbWC.settings.i18n?.services || 'Services') + '</span><span>' + WpBnbWC.formatPrice(servicesTotal) + '</span></div>';
+			}
+
+			html += '<div class="price-row total"><span>' + (WpBnbWC.settings.i18n?.total || 'Total') + '</span><span>' + WpBnbWC.formatPrice(grandTotal) + '</span></div>';
+
+			$priceDisplay.html(html).show();
+		}
+
+		enableSubmit() {
+			this.$form.find('.add-to-cart-btn').prop('disabled', false);
+		}
+
+		disableSubmit() {
+			this.$form.find('.add-to-cart-btn').prop('disabled', true);
+		}
+
+		onSubmit(e) {
+			// Form will submit normally - WooCommerce handles the add to cart
+			// Just validate one more time
+			const checkIn = this.$form.find('[name="bnb_check_in"]').val();
+			const checkOut = this.$form.find('[name="bnb_check_out"]').val();
+
+			if (!checkIn || !checkOut) {
+				e.preventDefault();
+				alert(WpBnbWC.settings.i18n?.selectDates || 'Please select check-in and check-out dates');
+				return false;
+			}
+		}
+	}
+
+	/**
+	 * Format price
+	 */
+	WpBnbWC.formatPrice = function (price) {
+		const currency = this.settings.currency || 'CHF';
+		const symbol = this.settings.currencySymbol || currency;
+		const decimals = this.settings.priceDecimals || 2;
+		const decimalSep = this.settings.decimalSeparator || '.';
+		const thousandSep = this.settings.thousandSeparator || "'";
+
+		const formatted = price.toFixed(decimals).replace(/\B(?=(\d{3})+(?!\d))/g, thousandSep).replace('.', decimalSep);
+
+		return symbol + ' ' + formatted;
+	};
+
+	// Initialize on DOM ready
+	$(document).ready(function () {
+		WpBnbWC.init();
+	});
+
+	// Export for external use
+	window.WpBnbWC = WpBnbWC;
+
+})(jQuery);

src/Integration/WooCommerce/AdminColumns.php

@@ -0,0 +1,282 @@
+<?php
+/**
+ * WooCommerce Admin Columns.
+ *
+ * Adds cross-reference columns and links between bookings and orders.
+ *
+ * @package Magdev\WpBnb\Integration\WooCommerce
+ */
+
+declare( strict_types=1 );
+
+namespace Magdev\WpBnb\Integration\WooCommerce;
+
+use Magdev\WpBnb\PostTypes\Booking;
+
+/**
+ * Admin Columns class.
+ *
+ * Enhances admin list tables with booking-order cross-references.
+ */
+final class AdminColumns {
+
+	/**
+	 * Initialize admin columns.
+	 *
+	 * @return void
+	 */
+	public static function init(): void {
+		// Add WC Order column to bookings list.
+		add_filter( 'manage_' . Booking::POST_TYPE . '_posts_columns', array( self::class, 'add_booking_columns' ) );
+		add_action( 'manage_' . Booking::POST_TYPE . '_posts_custom_column', array( self::class, 'render_booking_column' ), 10, 2 );
+
+		// Add Booking column to WC orders list.
+		add_filter( 'manage_edit-shop_order_columns', array( self::class, 'add_order_columns' ) );
+		add_action( 'manage_shop_order_posts_custom_column', array( self::class, 'render_order_column' ), 10, 2 );
+
+		// Also support HPOS orders list.
+		add_filter( 'manage_woocommerce_page_wc-orders_columns', array( self::class, 'add_order_columns' ) );
+		add_action( 'manage_woocommerce_page_wc-orders_custom_column', array( self::class, 'render_order_column_hpos' ), 10, 2 );
+
+		// Add row actions.
+		add_filter( 'post_row_actions', array( self::class, 'add_booking_row_actions' ), 10, 2 );
+
+		// Add order row actions.
+		add_filter( 'woocommerce_admin_order_actions', array( self::class, 'add_order_actions' ), 10, 2 );
+	}
+
+	/**
+	 * Add columns to booking admin list.
+	 *
+	 * @param array $columns Existing columns.
+	 * @return array Modified columns.
+	 */
+	public static function add_booking_columns( array $columns ): array {
+		// Insert WC Order column after status.
+		$new_columns = array();
+
+		foreach ( $columns as $key => $value ) {
+			$new_columns[ $key ] = $value;
+
+			if ( 'status' === $key ) {
+				$new_columns['wc_order'] = __( 'WC Order', 'wp-bnb' );
+			}
+		}
+
+		// If status column doesn't exist, add at the end.
+		if ( ! isset( $new_columns['wc_order'] ) ) {
+			$new_columns['wc_order'] = __( 'WC Order', 'wp-bnb' );
+		}
+
+		return $new_columns;
+	}
+
+	/**
+	 * Render booking admin column.
+	 *
+	 * @param string $column  Column name.
+	 * @param int    $post_id Post ID.
+	 * @return void
+	 */
+	public static function render_booking_column( string $column, int $post_id ): void {
+		if ( 'wc_order' !== $column ) {
+			return;
+		}
+
+		$order = Manager::get_order_for_booking( $post_id );
+
+		if ( ! $order ) {
+			echo '<span class="na">&ndash;</span>';
+			return;
+		}
+
+		$order_number = $order->get_order_number();
+		$order_status = $order->get_status();
+		$edit_url     = $order->get_edit_order_url();
+
+		printf(
+			'<a href="%s" class="order-view" title="%s">#%s</a>',
+			esc_url( $edit_url ),
+			esc_attr__( 'View order', 'wp-bnb' ),
+			esc_html( $order_number )
+		);
+
+		// Status badge.
+		$status_name = wc_get_order_status_name( $order_status );
+		printf(
+			'<br><mark class="order-status status-%s"><span>%s</span></mark>',
+			esc_attr( $order_status ),
+			esc_html( $status_name )
+		);
+	}
+
+	/**
+	 * Add columns to WooCommerce orders list.
+	 *
+	 * @param array $columns Existing columns.
+	 * @return array Modified columns.
+	 */
+	public static function add_order_columns( array $columns ): array {
+		// Insert Booking column after order_status.
+		$new_columns = array();
+
+		foreach ( $columns as $key => $value ) {
+			$new_columns[ $key ] = $value;
+
+			if ( 'order_status' === $key ) {
+				$new_columns['bnb_booking'] = __( 'Booking', 'wp-bnb' );
+			}
+		}
+
+		// If status column doesn't exist, add before actions.
+		if ( ! isset( $new_columns['bnb_booking'] ) ) {
+			$columns_before = array_slice( $columns, 0, -1, true );
+			$columns_after  = array_slice( $columns, -1, null, true );
+
+			$new_columns = $columns_before + array( 'bnb_booking' => __( 'Booking', 'wp-bnb' ) ) + $columns_after;
+		}
+
+		return $new_columns;
+	}
+
+	/**
+	 * Render order admin column (legacy post-based orders).
+	 *
+	 * @param string $column  Column name.
+	 * @param int    $post_id Post ID (Order ID).
+	 * @return void
+	 */
+	public static function render_order_column( string $column, int $post_id ): void {
+		if ( 'bnb_booking' !== $column ) {
+			return;
+		}
+
+		$order = wc_get_order( $post_id );
+
+		if ( ! $order ) {
+			echo '<span class="na">&ndash;</span>';
+			return;
+		}
+
+		self::render_booking_info_for_order( $order );
+	}
+
+	/**
+	 * Render order admin column (HPOS).
+	 *
+	 * @param string    $column Column name.
+	 * @param \WC_Order $order  Order object.
+	 * @return void
+	 */
+	public static function render_order_column_hpos( string $column, $order ): void {
+		if ( 'bnb_booking' !== $column ) {
+			return;
+		}
+
+		if ( ! $order instanceof \WC_Order ) {
+			echo '<span class="na">&ndash;</span>';
+			return;
+		}
+
+		self::render_booking_info_for_order( $order );
+	}
+
+	/**
+	 * Render booking info for an order.
+	 *
+	 * @param \WC_Order $order WooCommerce order.
+	 * @return void
+	 */
+	private static function render_booking_info_for_order( \WC_Order $order ): void {
+		$booking_id = Manager::get_booking_for_order( $order );
+
+		if ( ! $booking_id ) {
+			echo '<span class="na">&ndash;</span>';
+			return;
+		}
+
+		$booking   = get_post( $booking_id );
+		$check_in  = get_post_meta( $booking_id, '_bnb_booking_check_in', true );
+		$check_out = get_post_meta( $booking_id, '_bnb_booking_check_out', true );
+		$status    = get_post_meta( $booking_id, '_bnb_booking_status', true );
+
+		// Booking link.
+		printf(
+			'<a href="%s" title="%s">%s</a>',
+			esc_url( get_edit_post_link( $booking_id ) ),
+			esc_attr__( 'View booking', 'wp-bnb' ),
+			$booking ? esc_html( wp_trim_words( $booking->post_title, 3 ) ) : '#' . esc_html( $booking_id )
+		);
+
+		// Dates.
+		if ( $check_in && $check_out ) {
+			$check_in_date  = \DateTime::createFromFormat( 'Y-m-d', $check_in );
+			$check_out_date = \DateTime::createFromFormat( 'Y-m-d', $check_out );
+
+			if ( $check_in_date && $check_out_date ) {
+				printf(
+					'<br><small>%s - %s</small>',
+					esc_html( $check_in_date->format( 'd.m' ) ),
+					esc_html( $check_out_date->format( 'd.m.y' ) )
+				);
+			}
+		}
+
+		// Status badge.
+		if ( $status ) {
+			printf(
+				'<br><span class="bnb-status-badge bnb-status-%s" style="font-size: 10px;">%s</span>',
+				esc_attr( $status ),
+				esc_html( ucfirst( str_replace( '_', ' ', $status ) ) )
+			);
+		}
+	}
+
+	/**
+	 * Add row actions to booking list.
+	 *
+	 * @param array    $actions Existing actions.
+	 * @param \WP_Post $post    Post object.
+	 * @return array Modified actions.
+	 */
+	public static function add_booking_row_actions( array $actions, \WP_Post $post ): array {
+		if ( Booking::POST_TYPE !== $post->post_type ) {
+			return $actions;
+		}
+
+		$order = Manager::get_order_for_booking( $post->ID );
+
+		if ( $order ) {
+			$actions['view_order'] = sprintf(
+				'<a href="%s" aria-label="%s">%s</a>',
+				esc_url( $order->get_edit_order_url() ),
+				/* translators: %s: Order number */
+				esc_attr( sprintf( __( 'View order #%s', 'wp-bnb' ), $order->get_order_number() ) ),
+				__( 'View Order', 'wp-bnb' )
+			);
+		}
+
+		return $actions;
+	}
+
+	/**
+	 * Add actions to WooCommerce order row.
+	 *
+	 * @param array     $actions Existing actions.
+	 * @param \WC_Order $order   Order object.
+	 * @return array Modified actions.
+	 */
+	public static function add_order_actions( array $actions, \WC_Order $order ): array {
+		$booking_id = Manager::get_booking_for_order( $order );
+
+		if ( $booking_id ) {
+			$actions['view_booking'] = array(
+				'url'    => get_edit_post_link( $booking_id ),
+				'name'   => __( 'View Booking', 'wp-bnb' ),
+				'action' => 'view_booking',
+			);
+		}
+
+		return $actions;
+	}
+}

src/Integration/WooCommerce/CartHandler.php

@@ -0,0 +1,545 @@
+<?php
+/**
+ * WooCommerce Cart Handler.
+ *
+ * Handles cart item data, availability validation, and dynamic pricing.
+ *
+ * @package Magdev\WpBnb\Integration\WooCommerce
+ */
+
+declare( strict_types=1 );
+
+namespace Magdev\WpBnb\Integration\WooCommerce;
+
+use Magdev\WpBnb\Booking\Availability;
+use Magdev\WpBnb\PostTypes\Room;
+use Magdev\WpBnb\PostTypes\Service;
+use Magdev\WpBnb\Pricing\Calculator;
+
+/**
+ * Cart Handler class.
+ *
+ * Manages booking data in the WooCommerce cart, validates availability,
+ * and calculates dynamic pricing based on dates and services.
+ */
+final class CartHandler {
+
+	/**
+	 * Initialize cart handler.
+	 *
+	 * @return void
+	 */
+	public static function init(): void {
+		// Add booking data to cart item.
+		add_filter( 'woocommerce_add_cart_item_data', array( self::class, 'add_cart_item_data' ), 10, 3 );
+
+		// Restore booking data from session.
+		add_filter( 'woocommerce_get_cart_item_from_session', array( self::class, 'get_cart_item_from_session' ), 10, 2 );
+
+		// Validate before adding to cart.
+		add_filter( 'woocommerce_add_to_cart_validation', array( self::class, 'validate_add_to_cart' ), 10, 5 );
+
+		// Re-validate availability on cart load.
+		add_action( 'woocommerce_cart_loaded_from_session', array( self::class, 'validate_cart_items' ) );
+
+		// Display booking info in cart.
+		add_filter( 'woocommerce_get_item_data', array( self::class, 'display_cart_item_data' ), 10, 2 );
+
+		// Calculate dynamic price.
+		add_action( 'woocommerce_before_calculate_totals', array( self::class, 'calculate_cart_item_prices' ) );
+
+		// Prevent quantity changes for room products.
+		add_filter( 'woocommerce_quantity_input_args', array( self::class, 'lock_quantity' ), 10, 2 );
+
+		// Add booking data to order item meta.
+		add_action( 'woocommerce_checkout_create_order_line_item', array( self::class, 'add_order_item_meta' ), 10, 4 );
+	}
+
+	/**
+	 * Add a room to cart with booking data.
+	 *
+	 * @param int    $room_id   Room post ID.
+	 * @param string $check_in  Check-in date (Y-m-d).
+	 * @param string $check_out Check-out date (Y-m-d).
+	 * @param int    $guests    Number of guests.
+	 * @param array  $services  Array of service selections.
+	 * @return string|bool Cart item key or false on failure.
+	 */
+	public static function add_room_to_cart(
+		int $room_id,
+		string $check_in,
+		string $check_out,
+		int $guests = 1,
+		array $services = array()
+	) {
+		// Get product ID for room.
+		$product_id = ProductSync::get_product_for_room( $room_id );
+
+		if ( ! $product_id ) {
+			// Try to sync the room first.
+			$product_id = ProductSync::sync_room_to_product( $room_id );
+
+			if ( ! $product_id ) {
+				wc_add_notice( __( 'Unable to add room to cart. Product not found.', 'wp-bnb' ), 'error' );
+				return false;
+			}
+		}
+
+		// Store booking data in session temporarily for the filter.
+		WC()->session->set(
+			'bnb_pending_booking',
+			array(
+				'room_id'   => $room_id,
+				'check_in'  => $check_in,
+				'check_out' => $check_out,
+				'guests'    => $guests,
+				'services'  => $services,
+			)
+		);
+
+		// Add to cart.
+		$cart_item_key = WC()->cart->add_to_cart( $product_id, 1 );
+
+		// Clean up session.
+		WC()->session->set( 'bnb_pending_booking', null );
+
+		return $cart_item_key;
+	}
+
+	/**
+	 * Add booking data to cart item when adding to cart.
+	 *
+	 * @param array $cart_item_data Cart item data.
+	 * @param int   $product_id     Product ID.
+	 * @param int   $variation_id   Variation ID.
+	 * @return array Modified cart item data.
+	 */
+	public static function add_cart_item_data( array $cart_item_data, int $product_id, int $variation_id ): array {
+		// Check if this is a room product.
+		$room_id = ProductSync::get_room_for_product( $product_id );
+
+		if ( ! $room_id ) {
+			return $cart_item_data;
+		}
+
+		// Get booking data from session or POST.
+		$booking_data = WC()->session->get( 'bnb_pending_booking' );
+
+		if ( ! $booking_data ) {
+			// Try to get from POST (for direct form submissions).
+			// phpcs:disable WordPress.Security.NonceVerification.Missing
+			$booking_data = array(
+				'room_id'   => isset( $_POST['bnb_room_id'] ) ? absint( $_POST['bnb_room_id'] ) : $room_id,
+				'check_in'  => isset( $_POST['bnb_check_in'] ) ? sanitize_text_field( wp_unslash( $_POST['bnb_check_in'] ) ) : '',
+				'check_out' => isset( $_POST['bnb_check_out'] ) ? sanitize_text_field( wp_unslash( $_POST['bnb_check_out'] ) ) : '',
+				'guests'    => isset( $_POST['bnb_guests'] ) ? absint( $_POST['bnb_guests'] ) : 1,
+				'services'  => isset( $_POST['bnb_services'] ) ? self::sanitize_services( $_POST['bnb_services'] ) : array(),
+			);
+			// phpcs:enable WordPress.Security.NonceVerification.Missing
+		}
+
+		// Validate required fields.
+		if ( empty( $booking_data['check_in'] ) || empty( $booking_data['check_out'] ) ) {
+			return $cart_item_data;
+		}
+
+		// Calculate nights.
+		$check_in  = new \DateTime( $booking_data['check_in'] );
+		$check_out = new \DateTime( $booking_data['check_out'] );
+		$nights    = (int) $check_in->diff( $check_out )->days;
+
+		if ( $nights < 1 ) {
+			return $cart_item_data;
+		}
+
+		// Calculate price breakdown.
+		$calculator      = new Calculator( $room_id, $booking_data['check_in'], $booking_data['check_out'] );
+		$price_breakdown = $calculator->calculate();
+		$room_total      = $price_breakdown['total'];
+
+		// Calculate services total.
+		$services_total = 0;
+		$services_data  = array();
+
+		foreach ( $booking_data['services'] as $service_selection ) {
+			$service_id = $service_selection['service_id'] ?? 0;
+			$quantity   = $service_selection['quantity'] ?? 1;
+
+			if ( ! $service_id ) {
+				continue;
+			}
+
+			$service_price = Service::calculate_service_price( $service_id, $quantity, $nights );
+			$service_data  = Service::get_service_data( $service_id );
+
+			$services_data[] = array(
+				'service_id'   => $service_id,
+				'quantity'     => $quantity,
+				'price'        => $service_price,
+				'pricing_type' => $service_data['pricing_type'] ?? 'per_booking',
+				'name'         => $service_data['name'] ?? '',
+			);
+
+			$services_total += $service_price;
+		}
+
+		// Store booking data.
+		$cart_item_data[ Manager::CART_ITEM_KEY ] = array(
+			'room_id'         => $room_id,
+			'check_in'        => $booking_data['check_in'],
+			'check_out'       => $booking_data['check_out'],
+			'guests'          => $booking_data['guests'],
+			'nights'          => $nights,
+			'services'        => $services_data,
+			'price_breakdown' => array(
+				'room_total'     => $room_total,
+				'services_total' => $services_total,
+				'grand_total'    => $room_total + $services_total,
+				'full_breakdown' => $price_breakdown,
+			),
+		);
+
+		// Generate unique key based on booking data to allow multiple bookings.
+		$cart_item_data['unique_key'] = md5(
+			$room_id . $booking_data['check_in'] . $booking_data['check_out'] . microtime()
+		);
+
+		return $cart_item_data;
+	}
+
+	/**
+	 * Restore booking data from session.
+	 *
+	 * @param array $cart_item Cart item data.
+	 * @param array $values    Session values.
+	 * @return array Modified cart item data.
+	 */
+	public static function get_cart_item_from_session( array $cart_item, array $values ): array {
+		if ( isset( $values[ Manager::CART_ITEM_KEY ] ) ) {
+			$cart_item[ Manager::CART_ITEM_KEY ] = $values[ Manager::CART_ITEM_KEY ];
+		}
+		return $cart_item;
+	}
+
+	/**
+	 * Validate room availability before adding to cart.
+	 *
+	 * @param bool $passed     Whether validation passed.
+	 * @param int  $product_id Product ID.
+	 * @param int  $quantity   Quantity.
+	 * @param int  $variation_id Variation ID.
+	 * @param array $variations Variations.
+	 * @return bool
+	 */
+	public static function validate_add_to_cart( bool $passed, int $product_id, int $quantity, int $variation_id = 0, array $variations = array() ): bool {
+		// Check if this is a room product.
+		$room_id = ProductSync::get_room_for_product( $product_id );
+
+		if ( ! $room_id ) {
+			return $passed;
+		}
+
+		// Get booking data.
+		$booking_data = WC()->session->get( 'bnb_pending_booking' );
+
+		if ( ! $booking_data ) {
+			// phpcs:disable WordPress.Security.NonceVerification.Missing
+			$booking_data = array(
+				'check_in'  => isset( $_POST['bnb_check_in'] ) ? sanitize_text_field( wp_unslash( $_POST['bnb_check_in'] ) ) : '',
+				'check_out' => isset( $_POST['bnb_check_out'] ) ? sanitize_text_field( wp_unslash( $_POST['bnb_check_out'] ) ) : '',
+				'guests'    => isset( $_POST['bnb_guests'] ) ? absint( $_POST['bnb_guests'] ) : 1,
+			);
+			// phpcs:enable WordPress.Security.NonceVerification.Missing
+		}
+
+		// Validate dates provided.
+		if ( empty( $booking_data['check_in'] ) || empty( $booking_data['check_out'] ) ) {
+			wc_add_notice( __( 'Please select check-in and check-out dates.', 'wp-bnb' ), 'error' );
+			return false;
+		}
+
+		// Validate date format.
+		$check_in = \DateTime::createFromFormat( 'Y-m-d', $booking_data['check_in'] );
+		$check_out = \DateTime::createFromFormat( 'Y-m-d', $booking_data['check_out'] );
+
+		if ( ! $check_in || ! $check_out ) {
+			wc_add_notice( __( 'Invalid date format. Please use the date picker.', 'wp-bnb' ), 'error' );
+			return false;
+		}
+
+		// Validate check-out after check-in.
+		if ( $check_out <= $check_in ) {
+			wc_add_notice( __( 'Check-out date must be after check-in date.', 'wp-bnb' ), 'error' );
+			return false;
+		}
+
+		// Validate not in past.
+		$today = new \DateTime( 'today' );
+		if ( $check_in < $today ) {
+			wc_add_notice( __( 'Check-in date cannot be in the past.', 'wp-bnb' ), 'error' );
+			return false;
+		}
+
+		// Check availability.
+		$is_available = Availability::check_availability(
+			$room_id,
+			$booking_data['check_in'],
+			$booking_data['check_out']
+		);
+
+		if ( ! $is_available ) {
+			wc_add_notice( __( 'Sorry, this room is not available for the selected dates.', 'wp-bnb' ), 'error' );
+			return false;
+		}
+
+		// Check capacity.
+		$capacity = get_post_meta( $room_id, '_bnb_room_capacity', true );
+		if ( $capacity && $booking_data['guests'] > (int) $capacity ) {
+			wc_add_notice(
+				sprintf(
+					/* translators: %d: Room capacity */
+					__( 'This room has a maximum capacity of %d guests.', 'wp-bnb' ),
+					$capacity
+				),
+				'error'
+			);
+			return false;
+		}
+
+		// Check if same room with same dates already in cart.
+		foreach ( WC()->cart->get_cart() as $cart_item ) {
+			if ( isset( $cart_item[ Manager::CART_ITEM_KEY ] ) ) {
+				$existing = $cart_item[ Manager::CART_ITEM_KEY ];
+				if ( $existing['room_id'] === $room_id
+					&& $existing['check_in'] === $booking_data['check_in']
+					&& $existing['check_out'] === $booking_data['check_out']
+				) {
+					wc_add_notice( __( 'This room with the same dates is already in your cart.', 'wp-bnb' ), 'error' );
+					return false;
+				}
+			}
+		}
+
+		return $passed;
+	}
+
+	/**
+	 * Validate cart items on cart load.
+	 *
+	 * @param \WC_Cart $cart Cart object.
+	 * @return void
+	 */
+	public static function validate_cart_items( \WC_Cart $cart ): void {
+		$items_to_remove = array();
+
+		foreach ( $cart->get_cart() as $cart_item_key => $cart_item ) {
+			if ( ! isset( $cart_item[ Manager::CART_ITEM_KEY ] ) ) {
+				continue;
+			}
+
+			$booking_data = $cart_item[ Manager::CART_ITEM_KEY ];
+
+			// Check if dates are still valid.
+			$check_in = \DateTime::createFromFormat( 'Y-m-d', $booking_data['check_in'] );
+			$today    = new \DateTime( 'today' );
+
+			if ( $check_in < $today ) {
+				$items_to_remove[] = array(
+					'key'     => $cart_item_key,
+					'message' => __( 'A room booking was removed because the check-in date has passed.', 'wp-bnb' ),
+				);
+				continue;
+			}
+
+			// Check if room still available.
+			$is_available = Availability::check_availability(
+				$booking_data['room_id'],
+				$booking_data['check_in'],
+				$booking_data['check_out']
+			);
+
+			if ( ! $is_available ) {
+				$items_to_remove[] = array(
+					'key'     => $cart_item_key,
+					'message' => __( 'A room booking was removed because the room is no longer available for those dates.', 'wp-bnb' ),
+				);
+			}
+		}
+
+		// Remove invalid items.
+		foreach ( $items_to_remove as $item ) {
+			$cart->remove_cart_item( $item['key'] );
+			wc_add_notice( $item['message'], 'error' );
+		}
+	}
+
+	/**
+	 * Display booking info in cart.
+	 *
+	 * @param array $item_data Item data for display.
+	 * @param array $cart_item Cart item.
+	 * @return array Modified item data.
+	 */
+	public static function display_cart_item_data( array $item_data, array $cart_item ): array {
+		if ( ! isset( $cart_item[ Manager::CART_ITEM_KEY ] ) ) {
+			return $item_data;
+		}
+
+		$booking_data = $cart_item[ Manager::CART_ITEM_KEY ];
+
+		// Format dates.
+		$date_format = get_option( 'date_format' );
+		$check_in    = \DateTime::createFromFormat( 'Y-m-d', $booking_data['check_in'] );
+		$check_out   = \DateTime::createFromFormat( 'Y-m-d', $booking_data['check_out'] );
+
+		$item_data[] = array(
+			'key'   => __( 'Check-in', 'wp-bnb' ),
+			'value' => $check_in ? $check_in->format( $date_format ) : $booking_data['check_in'],
+		);
+
+		$item_data[] = array(
+			'key'   => __( 'Check-out', 'wp-bnb' ),
+			'value' => $check_out ? $check_out->format( $date_format ) : $booking_data['check_out'],
+		);
+
+		$item_data[] = array(
+			'key'   => __( 'Nights', 'wp-bnb' ),
+			'value' => $booking_data['nights'],
+		);
+
+		$item_data[] = array(
+			'key'   => __( 'Guests', 'wp-bnb' ),
+			'value' => $booking_data['guests'],
+		);
+
+		// Display services.
+		if ( ! empty( $booking_data['services'] ) ) {
+			$services_list = array();
+			foreach ( $booking_data['services'] as $service ) {
+				$services_list[] = $service['name'] . ' &times; ' . $service['quantity'];
+			}
+			$item_data[] = array(
+				'key'   => __( 'Services', 'wp-bnb' ),
+				'value' => implode( ', ', $services_list ),
+			);
+		}
+
+		return $item_data;
+	}
+
+	/**
+	 * Calculate dynamic prices for cart items.
+	 *
+	 * @param \WC_Cart $cart Cart object.
+	 * @return void
+	 */
+	public static function calculate_cart_item_prices( \WC_Cart $cart ): void {
+		if ( is_admin() && ! defined( 'DOING_AJAX' ) ) {
+			return;
+		}
+
+		foreach ( $cart->get_cart() as $cart_item ) {
+			if ( ! isset( $cart_item[ Manager::CART_ITEM_KEY ] ) ) {
+				continue;
+			}
+
+			$booking_data = $cart_item[ Manager::CART_ITEM_KEY ];
+			$grand_total  = $booking_data['price_breakdown']['grand_total'] ?? 0;
+
+			/**
+			 * Filter the cart item price for a booking.
+			 *
+			 * @param float $price       The calculated price.
+			 * @param array $cart_item   The cart item.
+			 */
+			$grand_total = apply_filters( 'wp_bnb_wc_cart_item_price', $grand_total, $cart_item );
+
+			// Set the price.
+			$cart_item['data']->set_price( $grand_total );
+		}
+	}
+
+	/**
+	 * Lock quantity to 1 for room products.
+	 *
+	 * @param array       $args    Input arguments.
+	 * @param \WC_Product $product Product object.
+	 * @return array Modified arguments.
+	 */
+	public static function lock_quantity( array $args, \WC_Product $product ): array {
+		if ( ProductSync::is_room_product( $product ) ) {
+			$args['min_value'] = 1;
+			$args['max_value'] = 1;
+			$args['readonly']  = true;
+		}
+		return $args;
+	}
+
+	/**
+	 * Add booking data to order item meta.
+	 *
+	 * @param \WC_Order_Item_Product $item          Order item.
+	 * @param string                 $cart_item_key Cart item key.
+	 * @param array                  $values        Cart item values.
+	 * @param \WC_Order              $order         Order object.
+	 * @return void
+	 */
+	public static function add_order_item_meta( \WC_Order_Item_Product $item, string $cart_item_key, array $values, \WC_Order $order ): void {
+		if ( ! isset( $values[ Manager::CART_ITEM_KEY ] ) ) {
+			return;
+		}
+
+		$booking_data = $values[ Manager::CART_ITEM_KEY ];
+
+		// Store booking data in order item meta.
+		$item->add_meta_data( '_bnb_room_id', $booking_data['room_id'] );
+		$item->add_meta_data( '_bnb_check_in', $booking_data['check_in'] );
+		$item->add_meta_data( '_bnb_check_out', $booking_data['check_out'] );
+		$item->add_meta_data( '_bnb_guests', $booking_data['guests'] );
+		$item->add_meta_data( '_bnb_nights', $booking_data['nights'] );
+		$item->add_meta_data( '_bnb_services', wp_json_encode( $booking_data['services'] ) );
+		$item->add_meta_data( '_bnb_price_breakdown', wp_json_encode( $booking_data['price_breakdown'] ) );
+
+		// Add visible meta for admin display.
+		$date_format = get_option( 'date_format' );
+		$check_in    = \DateTime::createFromFormat( 'Y-m-d', $booking_data['check_in'] );
+		$check_out   = \DateTime::createFromFormat( 'Y-m-d', $booking_data['check_out'] );
+
+		$item->add_meta_data( __( 'Check-in', 'wp-bnb' ), $check_in ? $check_in->format( $date_format ) : $booking_data['check_in'] );
+		$item->add_meta_data( __( 'Check-out', 'wp-bnb' ), $check_out ? $check_out->format( $date_format ) : $booking_data['check_out'] );
+		$item->add_meta_data( __( 'Nights', 'wp-bnb' ), $booking_data['nights'] );
+		$item->add_meta_data( __( 'Guests', 'wp-bnb' ), $booking_data['guests'] );
+	}
+
+	/**
+	 * Sanitize services array from POST data.
+	 *
+	 * @param mixed $services Raw services data.
+	 * @return array Sanitized services array.
+	 */
+	private static function sanitize_services( $services ): array {
+		if ( ! is_array( $services ) ) {
+			return array();
+		}
+
+		$sanitized = array();
+
+		foreach ( $services as $service ) {
+			if ( ! is_array( $service ) ) {
+				continue;
+			}
+
+			$service_id = isset( $service['service_id'] ) ? absint( $service['service_id'] ) : 0;
+			$quantity   = isset( $service['quantity'] ) ? absint( $service['quantity'] ) : 1;
+
+			if ( $service_id > 0 ) {
+				$sanitized[] = array(
+					'service_id' => $service_id,
+					'quantity'   => max( 1, $quantity ),
+				);
+			}
+		}
+
+		return $sanitized;
+	}
+}

src/Integration/WooCommerce/CheckoutHandler.php

@@ -0,0 +1,347 @@
+<?php
+/**
+ * WooCommerce Checkout Handler.
+ *
+ * Handles checkout field customization and validation.
+ *
+ * @package Magdev\WpBnb\Integration\WooCommerce
+ */
+
+declare( strict_types=1 );
+
+namespace Magdev\WpBnb\Integration\WooCommerce;
+
+use Magdev\WpBnb\Booking\Availability;
+use Magdev\WpBnb\PostTypes\Guest;
+use Magdev\WpBnb\PostTypes\Room;
+
+/**
+ * Checkout Handler class.
+ *
+ * Manages checkout field customization, pre-filling, and validation.
+ */
+final class CheckoutHandler {
+
+	/**
+	 * Initialize checkout handler.
+	 *
+	 * @return void
+	 */
+	public static function init(): void {
+		// Add custom checkout fields.
+		add_filter( 'woocommerce_checkout_fields', array( self::class, 'add_checkout_fields' ) );
+
+		// Pre-fill checkout fields.
+		add_filter( 'woocommerce_checkout_get_value', array( self::class, 'prefill_checkout_fields' ), 10, 2 );
+
+		// Validate checkout.
+		add_action( 'woocommerce_after_checkout_validation', array( self::class, 'validate_checkout' ), 10, 2 );
+
+		// Display booking summary in order review.
+		add_action( 'woocommerce_review_order_before_submit', array( self::class, 'display_booking_summary' ) );
+
+		// Save guest notes to order meta.
+		add_action( 'woocommerce_checkout_create_order', array( self::class, 'save_guest_notes' ), 10, 2 );
+	}
+
+	/**
+	 * Add custom checkout fields.
+	 *
+	 * @param array $fields Checkout fields.
+	 * @return array Modified checkout fields.
+	 */
+	public static function add_checkout_fields( array $fields ): array {
+		// Only add fields if cart contains BnB bookings.
+		if ( ! self::cart_has_bookings() ) {
+			return $fields;
+		}
+
+		// Add special requests field.
+		$fields['order']['bnb_guest_notes'] = array(
+			'type'        => 'textarea',
+			'label'       => __( 'Special Requests', 'wp-bnb' ),
+			'placeholder' => __( 'Any special requests, dietary requirements, or preferences...', 'wp-bnb' ),
+			'class'       => array( 'form-row-wide' ),
+			'required'    => false,
+			'priority'    => 90,
+		);
+
+		// Add expected arrival time.
+		$fields['order']['bnb_arrival_time'] = array(
+			'type'        => 'select',
+			'label'       => __( 'Expected Arrival Time', 'wp-bnb' ),
+			'class'       => array( 'form-row-wide' ),
+			'required'    => false,
+			'priority'    => 85,
+			'options'     => self::get_arrival_time_options(),
+		);
+
+		return $fields;
+	}
+
+	/**
+	 * Pre-fill checkout fields from guest data.
+	 *
+	 * @param mixed  $value Current value.
+	 * @param string $input Input field name.
+	 * @return mixed Pre-filled value.
+	 */
+	public static function prefill_checkout_fields( $value, string $input ) {
+		// Only for logged-in users.
+		if ( ! is_user_logged_in() ) {
+			return $value;
+		}
+
+		// Try to find an existing guest record by email.
+		$current_user = wp_get_current_user();
+		$guest        = self::find_guest_by_email( $current_user->user_email );
+
+		if ( ! $guest ) {
+			return $value;
+		}
+
+		$mappings = array(
+			'billing_first_name' => '_bnb_guest_first_name',
+			'billing_last_name'  => '_bnb_guest_last_name',
+			'billing_email'      => '_bnb_guest_email',
+			'billing_phone'      => '_bnb_guest_phone',
+			'billing_address_1'  => '_bnb_guest_address',
+			'billing_city'       => '_bnb_guest_city',
+			'billing_postcode'   => '_bnb_guest_postal_code',
+			'billing_country'    => '_bnb_guest_country',
+		);
+
+		if ( isset( $mappings[ $input ] ) ) {
+			$meta_value = get_post_meta( $guest->ID, $mappings[ $input ], true );
+			if ( $meta_value ) {
+				return $meta_value;
+			}
+		}
+
+		return $value;
+	}
+
+	/**
+	 * Validate checkout for BnB bookings.
+	 *
+	 * @param array     $data   Checkout data.
+	 * @param \WP_Error $errors Error object.
+	 * @return void
+	 */
+	public static function validate_checkout( array $data, \WP_Error $errors ): void {
+		// Re-validate availability for all bookings.
+		foreach ( WC()->cart->get_cart() as $cart_item_key => $cart_item ) {
+			if ( ! isset( $cart_item[ Manager::CART_ITEM_KEY ] ) ) {
+				continue;
+			}
+
+			$booking_data = $cart_item[ Manager::CART_ITEM_KEY ];
+
+			// Check availability one more time.
+			$is_available = Availability::check_availability(
+				$booking_data['room_id'],
+				$booking_data['check_in'],
+				$booking_data['check_out']
+			);
+
+			if ( ! $is_available ) {
+				$room = get_post( $booking_data['room_id'] );
+				$errors->add(
+					'bnb_room_unavailable',
+					sprintf(
+						/* translators: %s: Room name */
+						__( 'Sorry, %s is no longer available for the selected dates. Please update your cart.', 'wp-bnb' ),
+						$room ? $room->post_title : __( 'the room', 'wp-bnb' )
+					)
+				);
+			}
+
+			// Validate check-in date not in past.
+			$check_in = \DateTime::createFromFormat( 'Y-m-d', $booking_data['check_in'] );
+			$today    = new \DateTime( 'today' );
+
+			if ( $check_in < $today ) {
+				$errors->add(
+					'bnb_date_passed',
+					__( 'A booking in your cart has a check-in date in the past. Please update your cart.', 'wp-bnb' )
+				);
+			}
+		}
+	}
+
+	/**
+	 * Display booking summary in order review section.
+	 *
+	 * @return void
+	 */
+	public static function display_booking_summary(): void {
+		if ( ! self::cart_has_bookings() ) {
+			return;
+		}
+
+		$bookings = array();
+
+		foreach ( WC()->cart->get_cart() as $cart_item ) {
+			if ( ! isset( $cart_item[ Manager::CART_ITEM_KEY ] ) ) {
+				continue;
+			}
+
+			$booking_data = $cart_item[ Manager::CART_ITEM_KEY ];
+			$room         = get_post( $booking_data['room_id'] );
+
+			if ( ! $room ) {
+				continue;
+			}
+
+			$building = Room::get_building( $booking_data['room_id'] );
+
+			$date_format = get_option( 'date_format' );
+			$check_in    = \DateTime::createFromFormat( 'Y-m-d', $booking_data['check_in'] );
+			$check_out   = \DateTime::createFromFormat( 'Y-m-d', $booking_data['check_out'] );
+
+			$bookings[] = array(
+				'room_name'     => $room->post_title,
+				'building_name' => $building ? $building->post_title : '',
+				'check_in'      => $check_in ? $check_in->format( $date_format ) : '',
+				'check_out'     => $check_out ? $check_out->format( $date_format ) : '',
+				'nights'        => $booking_data['nights'],
+				'guests'        => $booking_data['guests'],
+			);
+		}
+
+		if ( empty( $bookings ) ) {
+			return;
+		}
+		?>
+		<div class="bnb-checkout-booking-summary">
+			<h3><?php esc_html_e( 'Booking Summary', 'wp-bnb' ); ?></h3>
+			<?php foreach ( $bookings as $booking ) : ?>
+				<div class="bnb-booking-item">
+					<strong><?php echo esc_html( $booking['room_name'] ); ?></strong>
+					<?php if ( $booking['building_name'] ) : ?>
+						<span class="bnb-building-name"><?php echo esc_html( $booking['building_name'] ); ?></span>
+					<?php endif; ?>
+					<div class="bnb-booking-details">
+						<span>
+							<?php
+							printf(
+								/* translators: 1: Check-in date, 2: Check-out date */
+								esc_html__( '%1$s to %2$s', 'wp-bnb' ),
+								esc_html( $booking['check_in'] ),
+								esc_html( $booking['check_out'] )
+							);
+							?>
+						</span>
+						<span>
+							<?php
+							printf(
+								/* translators: %d: Number of nights */
+								esc_html( _n( '%d night', '%d nights', $booking['nights'], 'wp-bnb' ) ),
+								$booking['nights']
+							);
+							?>
+						</span>
+						<span>
+							<?php
+							printf(
+								/* translators: %d: Number of guests */
+								esc_html( _n( '%d guest', '%d guests', $booking['guests'], 'wp-bnb' ) ),
+								$booking['guests']
+							);
+							?>
+						</span>
+					</div>
+				</div>
+			<?php endforeach; ?>
+		</div>
+		<?php
+	}
+
+	/**
+	 * Save guest notes to order meta.
+	 *
+	 * @param \WC_Order $order Order object.
+	 * @param array     $data  Checkout data.
+	 * @return void
+	 */
+	public static function save_guest_notes( \WC_Order $order, array $data ): void {
+		// phpcs:disable WordPress.Security.NonceVerification.Missing
+		if ( isset( $_POST['bnb_guest_notes'] ) && ! empty( $_POST['bnb_guest_notes'] ) ) {
+			$order->update_meta_data(
+				'_bnb_guest_notes',
+				sanitize_textarea_field( wp_unslash( $_POST['bnb_guest_notes'] ) )
+			);
+		}
+
+		if ( isset( $_POST['bnb_arrival_time'] ) && ! empty( $_POST['bnb_arrival_time'] ) ) {
+			$order->update_meta_data(
+				'_bnb_arrival_time',
+				sanitize_text_field( wp_unslash( $_POST['bnb_arrival_time'] ) )
+			);
+		}
+		// phpcs:enable WordPress.Security.NonceVerification.Missing
+	}
+
+	/**
+	 * Check if cart contains BnB bookings.
+	 *
+	 * @return bool
+	 */
+	public static function cart_has_bookings(): bool {
+		if ( ! WC()->cart ) {
+			return false;
+		}
+
+		foreach ( WC()->cart->get_cart() as $cart_item ) {
+			if ( isset( $cart_item[ Manager::CART_ITEM_KEY ] ) ) {
+				return true;
+			}
+		}
+
+		return false;
+	}
+
+	/**
+	 * Get arrival time options.
+	 *
+	 * @return array
+	 */
+	private static function get_arrival_time_options(): array {
+		$options = array(
+			''     => __( 'Select arrival time (optional)', 'wp-bnb' ),
+			'0-2'  => __( 'Early morning (00:00 - 02:00)', 'wp-bnb' ),
+			'2-6'  => __( 'Night (02:00 - 06:00)', 'wp-bnb' ),
+			'6-10' => __( 'Morning (06:00 - 10:00)', 'wp-bnb' ),
+			'10-14' => __( 'Late morning (10:00 - 14:00)', 'wp-bnb' ),
+			'14-18' => __( 'Afternoon (14:00 - 18:00)', 'wp-bnb' ),
+			'18-22' => __( 'Evening (18:00 - 22:00)', 'wp-bnb' ),
+			'22-24' => __( 'Late evening (22:00 - 00:00)', 'wp-bnb' ),
+		);
+
+		return $options;
+	}
+
+	/**
+	 * Find guest by email address.
+	 *
+	 * @param string $email Email address.
+	 * @return \WP_Post|null Guest post or null.
+	 */
+	private static function find_guest_by_email( string $email ): ?\WP_Post {
+		$guests = get_posts(
+			array(
+				'post_type'      => Guest::POST_TYPE,
+				'posts_per_page' => 1,
+				'post_status'    => 'publish',
+				'meta_query'     => array(
+					array(
+						'key'   => '_bnb_guest_email',
+						'value' => $email,
+					),
+				),
+			)
+		);
+
+		return $guests[0] ?? null;
+	}
+}

src/Integration/WooCommerce/InvoiceGenerator.php

@@ -0,0 +1,633 @@
+<?php
+/**
+ * WooCommerce Invoice Generator.
+ *
+ * Generates PDF invoices for WooCommerce orders.
+ *
+ * @package Magdev\WpBnb\Integration\WooCommerce
+ */
+
+declare( strict_types=1 );
+
+namespace Magdev\WpBnb\Integration\WooCommerce;
+
+use Magdev\WpBnb\PostTypes\Room;
+use Magdev\WpBnb\Pricing\Calculator;
+use Mpdf\Mpdf;
+
+/**
+ * Invoice Generator class.
+ *
+ * Creates PDF invoices for bookings using mPDF.
+ */
+final class InvoiceGenerator {
+
+	/**
+	 * Invoice storage directory relative to uploads.
+	 */
+	private const INVOICE_DIR = 'wp-bnb-invoices';
+
+	/**
+	 * Initialize invoice generator.
+	 *
+	 * @return void
+	 */
+	public static function init(): void {
+		// Attach invoice to order emails.
+		add_filter( 'woocommerce_email_attachments', array( self::class, 'attach_invoice_to_email' ), 10, 4 );
+
+		// Add admin order action button.
+		add_action( 'woocommerce_admin_order_actions_end', array( self::class, 'add_order_action_button' ) );
+
+		// AJAX handler for invoice generation.
+		add_action( 'wp_ajax_wp_bnb_generate_invoice', array( self::class, 'ajax_generate_invoice' ) );
+
+		// Handle invoice download.
+		add_action( 'init', array( self::class, 'handle_invoice_download' ) );
+	}
+
+	/**
+	 * Generate invoice for an order.
+	 *
+	 * @param \WC_Order $order WooCommerce order.
+	 * @return string|null Invoice file path or null on failure.
+	 */
+	public static function generate_invoice( \WC_Order $order ): ?string {
+		/**
+		 * Fires before generating an invoice.
+		 *
+		 * @param \WC_Order $order WooCommerce order.
+		 */
+		do_action( 'wp_bnb_wc_before_invoice_generate', $order );
+
+		// Get or generate invoice number.
+		$invoice_number = self::get_invoice_number( $order );
+
+		// Get booking data.
+		$booking_id = Manager::get_booking_for_order( $order );
+
+		// Generate HTML content.
+		$html = self::get_invoice_html( $order, $invoice_number, $booking_id );
+
+		// Generate PDF.
+		try {
+			$temp_dir = get_temp_dir() . 'mpdf';
+			if ( ! file_exists( $temp_dir ) ) {
+				wp_mkdir_p( $temp_dir );
+			}
+
+			$mpdf = new Mpdf(
+				array(
+					'mode'          => 'utf-8',
+					'format'        => 'A4',
+					'margin_left'   => 15,
+					'margin_right'  => 15,
+					'margin_top'    => 15,
+					'margin_bottom' => 20,
+					'tempDir'       => $temp_dir,
+				)
+			);
+
+			$mpdf->SetTitle( sprintf( 'Invoice %s', $invoice_number ) );
+			$mpdf->SetAuthor( get_option( 'wp_bnb_business_name', get_bloginfo( 'name' ) ) );
+			$mpdf->SetCreator( 'WP BnB' );
+
+			$mpdf->WriteHTML( $html );
+
+			// Save to file.
+			$file_path = self::get_invoice_path( $order, $invoice_number );
+			$mpdf->Output( $file_path, 'F' );
+
+			// Store invoice number and path in order meta.
+			$order->update_meta_data( '_bnb_invoice_number', $invoice_number );
+			$order->update_meta_data( '_bnb_invoice_path', $file_path );
+			$order->update_meta_data( '_bnb_invoice_date', current_time( 'mysql' ) );
+			$order->save();
+
+			/**
+			 * Fires after generating an invoice.
+			 *
+			 * @param \WC_Order $order     WooCommerce order.
+			 * @param string    $file_path Invoice file path.
+			 */
+			do_action( 'wp_bnb_wc_after_invoice_generate', $order, $file_path );
+
+			return $file_path;
+
+		} catch ( \Exception $e ) {
+			error_log( 'WP BnB Invoice generation failed: ' . $e->getMessage() );
+			return null;
+		}
+	}
+
+	/**
+	 * Get invoice number for an order.
+	 *
+	 * @param \WC_Order $order WooCommerce order.
+	 * @return string Invoice number.
+	 */
+	public static function get_invoice_number( \WC_Order $order ): string {
+		// Check if already has invoice number.
+		$existing = $order->get_meta( '_bnb_invoice_number', true );
+
+		if ( $existing ) {
+			return $existing;
+		}
+
+		// Generate new invoice number.
+		return Manager::get_next_invoice_number();
+	}
+
+	/**
+	 * Get invoice file path.
+	 *
+	 * @param \WC_Order $order          WooCommerce order.
+	 * @param string    $invoice_number Invoice number.
+	 * @return string File path.
+	 */
+	private static function get_invoice_path( \WC_Order $order, string $invoice_number ): string {
+		$upload_dir = wp_upload_dir();
+		$invoice_dir = $upload_dir['basedir'] . '/' . self::INVOICE_DIR;
+
+		// Create directory if needed.
+		if ( ! file_exists( $invoice_dir ) ) {
+			wp_mkdir_p( $invoice_dir );
+
+			// Add .htaccess to protect invoices.
+			$htaccess = $invoice_dir . '/.htaccess';
+			if ( ! file_exists( $htaccess ) ) {
+				file_put_contents( $htaccess, 'Deny from all' );
+			}
+
+			// Add index.php for extra protection.
+			$index = $invoice_dir . '/index.php';
+			if ( ! file_exists( $index ) ) {
+				file_put_contents( $index, '<?php // Silence is golden.' );
+			}
+		}
+
+		// Sanitize invoice number for filename.
+		$safe_number = sanitize_file_name( $invoice_number );
+
+		return $invoice_dir . '/invoice-' . $safe_number . '-' . $order->get_id() . '.pdf';
+	}
+
+	/**
+	 * Check if invoice exists for an order.
+	 *
+	 * @param \WC_Order $order WooCommerce order.
+	 * @return bool
+	 */
+	public static function invoice_exists( \WC_Order $order ): bool {
+		$path = $order->get_meta( '_bnb_invoice_path', true );
+
+		return $path && file_exists( $path );
+	}
+
+	/**
+	 * Attach invoice to email.
+	 *
+	 * @param array      $attachments Attachments array.
+	 * @param string     $email_id    Email ID.
+	 * @param \WC_Order  $order       WooCommerce order.
+	 * @param \WC_Email  $email       Email object.
+	 * @return array Modified attachments.
+	 */
+	public static function attach_invoice_to_email( array $attachments, string $email_id, $order, $email ): array {
+		// Only attach to specific emails.
+		$allowed_emails = array(
+			'customer_completed_order',
+			'customer_processing_order',
+			'customer_invoice',
+		);
+
+		if ( ! in_array( $email_id, $allowed_emails, true ) ) {
+			return $attachments;
+		}
+
+		// Check if order is a WC_Order.
+		if ( ! $order instanceof \WC_Order ) {
+			return $attachments;
+		}
+
+		// Check if invoice attachment is enabled.
+		if ( ! Manager::is_invoice_attach_enabled() ) {
+			return $attachments;
+		}
+
+		// Check if this order has a booking.
+		$booking_id = Manager::get_booking_for_order( $order );
+
+		if ( ! $booking_id ) {
+			return $attachments;
+		}
+
+		// Generate invoice if it doesn't exist.
+		if ( ! self::invoice_exists( $order ) ) {
+			self::generate_invoice( $order );
+		}
+
+		// Get invoice path.
+		$invoice_path = $order->get_meta( '_bnb_invoice_path', true );
+
+		if ( $invoice_path && file_exists( $invoice_path ) ) {
+			$attachments[] = $invoice_path;
+		}
+
+		return $attachments;
+	}
+
+	/**
+	 * Add order action button for invoice.
+	 *
+	 * @param \WC_Order $order WooCommerce order.
+	 * @return void
+	 */
+	public static function add_order_action_button( \WC_Order $order ): void {
+		// Check if this order has a booking.
+		$booking_id = Manager::get_booking_for_order( $order );
+
+		if ( ! $booking_id ) {
+			return;
+		}
+
+		// Generate download URL.
+		$download_url = add_query_arg(
+			array(
+				'bnb_download_invoice' => $order->get_id(),
+				'_wpnonce'             => wp_create_nonce( 'bnb_download_invoice_' . $order->get_id() ),
+			),
+			admin_url( 'admin.php' )
+		);
+
+		?>
+		<a class="button tips" href="<?php echo esc_url( $download_url ); ?>"
+		   data-tip="<?php esc_attr_e( 'Download Invoice', 'wp-bnb' ); ?>">
+			<span class="dashicons dashicons-pdf" style="vertical-align: middle;"></span>
+		</a>
+		<?php
+	}
+
+	/**
+	 * AJAX handler for generating invoice.
+	 *
+	 * @return void
+	 */
+	public static function ajax_generate_invoice(): void {
+		check_ajax_referer( 'wp_bnb_admin_nonce', 'nonce' );
+
+		if ( ! current_user_can( 'manage_woocommerce' ) ) {
+			wp_send_json_error( array( 'message' => __( 'Permission denied.', 'wp-bnb' ) ) );
+		}
+
+		$order_id = isset( $_POST['order_id'] ) ? absint( $_POST['order_id'] ) : 0;
+
+		if ( ! $order_id ) {
+			wp_send_json_error( array( 'message' => __( 'Invalid order ID.', 'wp-bnb' ) ) );
+		}
+
+		$order = wc_get_order( $order_id );
+
+		if ( ! $order ) {
+			wp_send_json_error( array( 'message' => __( 'Order not found.', 'wp-bnb' ) ) );
+		}
+
+		$file_path = self::generate_invoice( $order );
+
+		if ( $file_path ) {
+			wp_send_json_success( array( 'message' => __( 'Invoice generated successfully.', 'wp-bnb' ) ) );
+		} else {
+			wp_send_json_error( array( 'message' => __( 'Failed to generate invoice.', 'wp-bnb' ) ) );
+		}
+	}
+
+	/**
+	 * Handle invoice download request.
+	 *
+	 * @return void
+	 */
+	public static function handle_invoice_download(): void {
+		// phpcs:ignore WordPress.Security.NonceVerification.Recommended
+		if ( ! isset( $_GET['bnb_download_invoice'] ) ) {
+			return;
+		}
+
+		$order_id = absint( $_GET['bnb_download_invoice'] );
+
+		// Verify nonce.
+		if ( ! isset( $_GET['_wpnonce'] ) || ! wp_verify_nonce( sanitize_key( $_GET['_wpnonce'] ), 'bnb_download_invoice_' . $order_id ) ) {
+			wp_die( esc_html__( 'Security check failed.', 'wp-bnb' ) );
+		}
+
+		// Check capabilities.
+		if ( ! current_user_can( 'manage_woocommerce' ) ) {
+			wp_die( esc_html__( 'You do not have permission to download invoices.', 'wp-bnb' ) );
+		}
+
+		$order = wc_get_order( $order_id );
+
+		if ( ! $order ) {
+			wp_die( esc_html__( 'Order not found.', 'wp-bnb' ) );
+		}
+
+		// Generate invoice if needed.
+		if ( ! self::invoice_exists( $order ) ) {
+			self::generate_invoice( $order );
+		}
+
+		$invoice_path = $order->get_meta( '_bnb_invoice_path', true );
+
+		if ( ! $invoice_path || ! file_exists( $invoice_path ) ) {
+			wp_die( esc_html__( 'Invoice not found.', 'wp-bnb' ) );
+		}
+
+		$invoice_number = $order->get_meta( '_bnb_invoice_number', true );
+		$filename       = 'invoice-' . sanitize_file_name( $invoice_number ) . '.pdf';
+
+		// Output file.
+		header( 'Content-Type: application/pdf' );
+		header( 'Content-Disposition: attachment; filename="' . $filename . '"' );
+		header( 'Content-Length: ' . filesize( $invoice_path ) );
+		header( 'Cache-Control: no-cache, no-store, must-revalidate' );
+
+		readfile( $invoice_path );
+		exit;
+	}
+
+	/**
+	 * Get invoice HTML content.
+	 *
+	 * @param \WC_Order $order          WooCommerce order.
+	 * @param string    $invoice_number Invoice number.
+	 * @param int|null  $booking_id     Booking ID.
+	 * @return string HTML content.
+	 */
+	private static function get_invoice_html( \WC_Order $order, string $invoice_number, ?int $booking_id ): string {
+		// Get business info.
+		$business = self::get_business_info();
+
+		// Get booking details.
+		$check_in  = '';
+		$check_out = '';
+		$room_name = '';
+		$building_name = '';
+		$nights    = 0;
+		$guests    = 0;
+
+		if ( $booking_id ) {
+			$check_in  = get_post_meta( $booking_id, '_bnb_booking_check_in', true );
+			$check_out = get_post_meta( $booking_id, '_bnb_booking_check_out', true );
+			$guests    = get_post_meta( $booking_id, '_bnb_booking_adults', true );
+			$room_id   = get_post_meta( $booking_id, '_bnb_booking_room_id', true );
+
+			if ( $room_id ) {
+				$room = get_post( $room_id );
+				$room_name = $room ? $room->post_title : '';
+				$building = Room::get_building( $room_id );
+				$building_name = $building ? $building->post_title : '';
+			}
+
+			if ( $check_in && $check_out ) {
+				$check_in_date  = \DateTime::createFromFormat( 'Y-m-d', $check_in );
+				$check_out_date = \DateTime::createFromFormat( 'Y-m-d', $check_out );
+				if ( $check_in_date && $check_out_date ) {
+					$nights = $check_in_date->diff( $check_out_date )->days;
+				}
+			}
+		}
+
+		// Format dates.
+		$date_format       = get_option( 'date_format' );
+		$check_in_display  = $check_in ? date_i18n( $date_format, strtotime( $check_in ) ) : '';
+		$check_out_display = $check_out ? date_i18n( $date_format, strtotime( $check_out ) ) : '';
+		$order_date        = $order->get_date_created() ? $order->get_date_created()->date_i18n( $date_format ) : '';
+
+		// Get logo.
+		$logo_html = '';
+		$logo_id   = Manager::get_invoice_logo();
+		if ( $logo_id ) {
+			$logo_url = wp_get_attachment_url( $logo_id );
+			if ( $logo_url ) {
+				$logo_html = '<img src="' . esc_url( $logo_url ) . '" style="max-height: 60px; max-width: 200px;">';
+			}
+		}
+
+		// Get footer.
+		$footer_text = Manager::get_invoice_footer();
+
+		// Build HTML.
+		$html = '<html><head><style>' . self::get_invoice_css() . '</style></head><body>';
+
+		// Header.
+		$html .= '<div class="invoice-header">';
+		$html .= '<div class="logo">' . $logo_html . '</div>';
+		$html .= '<div class="invoice-title">';
+		$html .= '<h1>' . esc_html__( 'INVOICE', 'wp-bnb' ) . '</h1>';
+		$html .= '<p class="invoice-number">' . esc_html( $invoice_number ) . '</p>';
+		$html .= '<p class="invoice-date">' . esc_html( $order_date ) . '</p>';
+		$html .= '</div>';
+		$html .= '</div>';
+
+		// Addresses.
+		$html .= '<div class="addresses">';
+
+		// From.
+		$html .= '<div class="address from">';
+		$html .= '<h3>' . esc_html__( 'From', 'wp-bnb' ) . '</h3>';
+		$html .= '<p><strong>' . esc_html( $business['name'] ) . '</strong></p>';
+		if ( $business['street'] ) {
+			$html .= '<p>' . esc_html( $business['street'] ) . '</p>';
+		}
+		if ( $business['city'] || $business['postal'] ) {
+			$html .= '<p>' . esc_html( $business['postal'] . ' ' . $business['city'] ) . '</p>';
+		}
+		if ( $business['country'] ) {
+			$html .= '<p>' . esc_html( $business['country'] ) . '</p>';
+		}
+		if ( $business['email'] ) {
+			$html .= '<p>' . esc_html( $business['email'] ) . '</p>';
+		}
+		if ( $business['phone'] ) {
+			$html .= '<p>' . esc_html( $business['phone'] ) . '</p>';
+		}
+		$html .= '</div>';
+
+		// To.
+		$html .= '<div class="address to">';
+		$html .= '<h3>' . esc_html__( 'Bill To', 'wp-bnb' ) . '</h3>';
+		$html .= '<p><strong>' . esc_html( $order->get_billing_first_name() . ' ' . $order->get_billing_last_name() ) . '</strong></p>';
+		if ( $order->get_billing_address_1() ) {
+			$html .= '<p>' . esc_html( $order->get_billing_address_1() ) . '</p>';
+		}
+		if ( $order->get_billing_city() || $order->get_billing_postcode() ) {
+			$html .= '<p>' . esc_html( $order->get_billing_postcode() . ' ' . $order->get_billing_city() ) . '</p>';
+		}
+		if ( $order->get_billing_country() ) {
+			$html .= '<p>' . esc_html( WC()->countries->countries[ $order->get_billing_country() ] ?? $order->get_billing_country() ) . '</p>';
+		}
+		if ( $order->get_billing_email() ) {
+			$html .= '<p>' . esc_html( $order->get_billing_email() ) . '</p>';
+		}
+		$html .= '</div>';
+		$html .= '</div>';
+
+		// Booking details.
+		if ( $booking_id && $room_name ) {
+			$html .= '<div class="booking-details">';
+			$html .= '<h3>' . esc_html__( 'Booking Details', 'wp-bnb' ) . '</h3>';
+			$html .= '<table class="details-table">';
+			$html .= '<tr><td><strong>' . esc_html__( 'Room', 'wp-bnb' ) . '</strong></td><td>' . esc_html( $room_name );
+			if ( $building_name ) {
+				$html .= ' <small>(' . esc_html( $building_name ) . ')</small>';
+			}
+			$html .= '</td></tr>';
+			$html .= '<tr><td><strong>' . esc_html__( 'Check-in', 'wp-bnb' ) . '</strong></td><td>' . esc_html( $check_in_display ) . '</td></tr>';
+			$html .= '<tr><td><strong>' . esc_html__( 'Check-out', 'wp-bnb' ) . '</strong></td><td>' . esc_html( $check_out_display ) . '</td></tr>';
+			$html .= '<tr><td><strong>' . esc_html__( 'Nights', 'wp-bnb' ) . '</strong></td><td>' . esc_html( $nights ) . '</td></tr>';
+			$html .= '<tr><td><strong>' . esc_html__( 'Guests', 'wp-bnb' ) . '</strong></td><td>' . esc_html( $guests ) . '</td></tr>';
+			$html .= '</table>';
+			$html .= '</div>';
+		}
+
+		// Line items.
+		$html .= '<div class="line-items">';
+		$html .= '<table class="items-table">';
+		$html .= '<thead><tr>';
+		$html .= '<th class="description">' . esc_html__( 'Description', 'wp-bnb' ) . '</th>';
+		$html .= '<th class="qty">' . esc_html__( 'Qty', 'wp-bnb' ) . '</th>';
+		$html .= '<th class="price">' . esc_html__( 'Price', 'wp-bnb' ) . '</th>';
+		$html .= '<th class="total">' . esc_html__( 'Total', 'wp-bnb' ) . '</th>';
+		$html .= '</tr></thead>';
+		$html .= '<tbody>';
+
+		foreach ( $order->get_items() as $item ) {
+			$qty   = $item->get_quantity();
+			$total = $item->get_total();
+			$price = $qty > 0 ? $total / $qty : $total;
+
+			$html .= '<tr>';
+			$html .= '<td class="description">' . esc_html( $item->get_name() ) . '</td>';
+			$html .= '<td class="qty">' . esc_html( $qty ) . '</td>';
+			$html .= '<td class="price">' . wc_price( $price ) . '</td>';
+			$html .= '<td class="total">' . wc_price( $total ) . '</td>';
+			$html .= '</tr>';
+		}
+
+		$html .= '</tbody>';
+		$html .= '</table>';
+		$html .= '</div>';
+
+		// Totals.
+		$html .= '<div class="totals">';
+		$html .= '<table class="totals-table">';
+		$html .= '<tr><td>' . esc_html__( 'Subtotal', 'wp-bnb' ) . '</td><td>' . wc_price( $order->get_subtotal() ) . '</td></tr>';
+
+		if ( $order->get_total_tax() > 0 ) {
+			$html .= '<tr><td>' . esc_html__( 'Tax', 'wp-bnb' ) . '</td><td>' . wc_price( $order->get_total_tax() ) . '</td></tr>';
+		}
+
+		$html .= '<tr class="grand-total"><td><strong>' . esc_html__( 'Total', 'wp-bnb' ) . '</strong></td><td><strong>' . wc_price( $order->get_total() ) . '</strong></td></tr>';
+		$html .= '</table>';
+		$html .= '</div>';
+
+		// Payment info.
+		$html .= '<div class="payment-info">';
+		$html .= '<p><strong>' . esc_html__( 'Payment Status:', 'wp-bnb' ) . '</strong> ';
+
+		if ( $order->is_paid() ) {
+			$html .= '<span class="paid">' . esc_html__( 'PAID', 'wp-bnb' ) . '</span>';
+		} else {
+			$html .= '<span class="unpaid">' . esc_html__( 'PENDING', 'wp-bnb' ) . '</span>';
+		}
+
+		$html .= '</p>';
+		$html .= '<p><strong>' . esc_html__( 'Payment Method:', 'wp-bnb' ) . '</strong> ' . esc_html( $order->get_payment_method_title() ) . '</p>';
+		$html .= '</div>';
+
+		// Footer.
+		$html .= '<div class="footer">';
+		$html .= '<p>' . esc_html__( 'Thank you for your stay!', 'wp-bnb' ) . '</p>';
+		if ( $footer_text ) {
+			$html .= '<p class="custom-footer">' . esc_html( $footer_text ) . '</p>';
+		}
+		$html .= '</div>';
+
+		$html .= '</body></html>';
+
+		/**
+		 * Filter the invoice HTML.
+		 *
+		 * @param string    $html  Invoice HTML.
+		 * @param \WC_Order $order WooCommerce order.
+		 */
+		return apply_filters( 'wp_bnb_wc_invoice_html', $html, $order );
+	}
+
+	/**
+	 * Get invoice CSS styles.
+	 *
+	 * @return string CSS content.
+	 */
+	private static function get_invoice_css(): string {
+		return '
+			body { font-family: DejaVu Sans, sans-serif; font-size: 10pt; color: #333; line-height: 1.4; }
+			h1 { font-size: 24pt; color: #2271b1; margin: 0; text-align: right; }
+			h3 { font-size: 11pt; color: #50575e; margin: 15pt 0 5pt 0; }
+
+			.invoice-header { margin-bottom: 30pt; overflow: hidden; }
+			.logo { float: left; width: 50%; }
+			.invoice-title { float: right; width: 50%; text-align: right; }
+			.invoice-number { font-size: 14pt; font-weight: bold; color: #333; margin: 5pt 0; }
+			.invoice-date { font-size: 10pt; color: #787c82; margin: 0; }
+
+			.addresses { margin-bottom: 20pt; overflow: hidden; }
+			.address { width: 48%; }
+			.address.from { float: left; }
+			.address.to { float: right; }
+			.address p { margin: 2pt 0; font-size: 9pt; }
+
+			.booking-details { margin-bottom: 20pt; background: #f9f9f9; padding: 10pt; border-radius: 4pt; }
+			.details-table { width: 100%; border-collapse: collapse; }
+			.details-table td { padding: 4pt 8pt; font-size: 9pt; border-bottom: 1px solid #e1e4e8; }
+			.details-table td:first-child { width: 120pt; }
+
+			.line-items { margin-bottom: 20pt; }
+			.items-table { width: 100%; border-collapse: collapse; }
+			.items-table th { background: #f6f7f7; text-align: left; padding: 8pt; font-size: 9pt; border-bottom: 2px solid #c3c4c7; }
+			.items-table td { padding: 8pt; font-size: 9pt; border-bottom: 1px solid #e1e4e8; }
+			.items-table .qty, .items-table .price, .items-table .total { text-align: right; width: 70pt; }
+
+			.totals { margin-bottom: 20pt; }
+			.totals-table { width: 250pt; margin-left: auto; border-collapse: collapse; }
+			.totals-table td { padding: 6pt 8pt; font-size: 10pt; }
+			.totals-table td:last-child { text-align: right; }
+			.totals-table .grand-total td { border-top: 2px solid #333; font-size: 12pt; }
+
+			.payment-info { margin-bottom: 30pt; padding: 10pt; background: #f9f9f9; border-radius: 4pt; }
+			.payment-info p { margin: 4pt 0; font-size: 9pt; }
+			.payment-info .paid { color: #00a32a; font-weight: bold; }
+			.payment-info .unpaid { color: #dba617; font-weight: bold; }
+
+			.footer { text-align: center; margin-top: 40pt; padding-top: 15pt; border-top: 1px solid #c3c4c7; }
+			.footer p { font-size: 9pt; color: #787c82; margin: 3pt 0; }
+			.custom-footer { font-size: 8pt; }
+		';
+	}
+
+	/**
+	 * Get business information from settings.
+	 *
+	 * @return array Business info.
+	 */
+	private static function get_business_info(): array {
+		return array(
+			'name'    => get_option( 'wp_bnb_business_name', get_bloginfo( 'name' ) ),
+			'street'  => get_option( 'wp_bnb_address_street', '' ),
+			'city'    => get_option( 'wp_bnb_address_city', '' ),
+			'postal'  => get_option( 'wp_bnb_address_postal', '' ),
+			'country' => get_option( 'wp_bnb_address_country', '' ),
+			'email'   => get_option( 'wp_bnb_contact_email', get_option( 'admin_email' ) ),
+			'phone'   => get_option( 'wp_bnb_contact_phone', '' ),
+		);
+	}
+}

src/Integration/WooCommerce/Manager.php

@@ -0,0 +1,435 @@
+<?php
+/**
+ * WooCommerce Integration Manager.
+ *
+ * Main integration class that initializes WooCommerce features.
+ *
+ * @package Magdev\WpBnb\Integration\WooCommerce
+ */
+
+declare( strict_types=1 );
+
+namespace Magdev\WpBnb\Integration\WooCommerce;
+
+/**
+ * WooCommerce Integration Manager class.
+ *
+ * Manages the integration with WooCommerce for payment processing,
+ * invoice generation, order management, and refund handling.
+ */
+final class Manager {
+
+	/**
+	 * Option key for enabling WooCommerce integration.
+	 */
+	public const OPTION_ENABLED = 'wp_bnb_wc_enabled';
+
+	/**
+	 * Option key for auto-syncing products.
+	 */
+	public const OPTION_AUTO_SYNC = 'wp_bnb_wc_auto_sync_products';
+
+	/**
+	 * Option key for auto-confirming bookings on payment.
+	 */
+	public const OPTION_AUTO_CONFIRM = 'wp_bnb_wc_auto_confirm_booking';
+
+	/**
+	 * Option key for attaching invoices to emails.
+	 */
+	public const OPTION_INVOICE_ATTACH = 'wp_bnb_wc_invoice_attach';
+
+	/**
+	 * Option key for product category.
+	 */
+	public const OPTION_PRODUCT_CATEGORY = 'wp_bnb_wc_product_category';
+
+	/**
+	 * Option key for services as products.
+	 */
+	public const OPTION_SERVICES_AS_PRODUCTS = 'wp_bnb_wc_services_as_products';
+
+	/**
+	 * Option key for invoice number prefix.
+	 */
+	public const OPTION_INVOICE_PREFIX = 'wp_bnb_invoice_prefix';
+
+	/**
+	 * Option key for invoice starting number.
+	 */
+	public const OPTION_INVOICE_START_NUMBER = 'wp_bnb_invoice_start_number';
+
+	/**
+	 * Option key for last invoice number.
+	 */
+	public const OPTION_INVOICE_LAST_NUMBER = 'wp_bnb_invoice_last_number';
+
+	/**
+	 * Option key for invoice logo.
+	 */
+	public const OPTION_INVOICE_LOGO = 'wp_bnb_invoice_logo';
+
+	/**
+	 * Option key for invoice footer text.
+	 */
+	public const OPTION_INVOICE_FOOTER = 'wp_bnb_invoice_footer';
+
+	/**
+	 * Order meta key for linked booking ID.
+	 */
+	public const ORDER_BOOKING_META = '_bnb_booking_id';
+
+	/**
+	 * Order meta key for linked room ID.
+	 */
+	public const ORDER_ROOM_META = '_bnb_room_id';
+
+	/**
+	 * Booking meta key for linked WC order ID.
+	 */
+	public const BOOKING_ORDER_META = '_bnb_booking_wc_order_id';
+
+	/**
+	 * Room meta key for linked WC product ID.
+	 */
+	public const ROOM_PRODUCT_META = '_bnb_wc_product_id';
+
+	/**
+	 * Product meta key for linked room ID.
+	 */
+	public const PRODUCT_ROOM_META = '_bnb_room_id';
+
+	/**
+	 * Cart item data key for booking data.
+	 */
+	public const CART_ITEM_KEY = 'bnb_booking_data';
+
+	/**
+	 * Whether components have been initialized.
+	 *
+	 * @var bool
+	 */
+	private static bool $initialized = false;
+
+	/**
+	 * Initialize the WooCommerce integration.
+	 *
+	 * @return void
+	 */
+	public static function init(): void {
+		// Prevent double initialization.
+		if ( self::$initialized ) {
+			return;
+		}
+
+		// Only proceed if WooCommerce is active.
+		if ( ! self::is_wc_active() ) {
+			return;
+		}
+
+		// Declare HPOS compatibility.
+		add_action( 'before_woocommerce_init', array( self::class, 'declare_hpos_compatibility' ) );
+
+		// Only initialize components if integration is enabled.
+		if ( ! self::is_enabled() ) {
+			return;
+		}
+
+		// Initialize sub-components after WooCommerce is fully loaded.
+		add_action( 'woocommerce_loaded', array( self::class, 'init_components' ) );
+
+		// Add admin notice if WooCommerce deactivated while integration enabled.
+		add_action( 'admin_notices', array( self::class, 'admin_notices' ) );
+
+		self::$initialized = true;
+	}
+
+	/**
+	 * Declare High-Performance Order Storage (HPOS) compatibility.
+	 *
+	 * @return void
+	 */
+	public static function declare_hpos_compatibility(): void {
+		if ( class_exists( \Automattic\WooCommerce\Utilities\FeaturesUtil::class ) ) {
+			\Automattic\WooCommerce\Utilities\FeaturesUtil::declare_compatibility(
+				'custom_order_tables',
+				WP_BNB_PATH . 'wp-bnb.php',
+				true
+			);
+		}
+	}
+
+	/**
+	 * Initialize all WooCommerce integration components.
+	 *
+	 * @return void
+	 */
+	public static function init_components(): void {
+		// Product synchronization (room <-> WC product).
+		ProductSync::init();
+
+		// Cart handling (booking data, availability, pricing).
+		CartHandler::init();
+
+		// Checkout customization.
+		CheckoutHandler::init();
+
+		// Order handling (booking creation on payment).
+		OrderHandler::init();
+
+		// Invoice generation.
+		InvoiceGenerator::init();
+
+		// Refund handling.
+		RefundHandler::init();
+
+		// Admin column enhancements.
+		if ( is_admin() ) {
+			AdminColumns::init();
+		}
+	}
+
+	/**
+	 * Check if WooCommerce is active.
+	 *
+	 * @return bool
+	 */
+	public static function is_wc_active(): bool {
+		return class_exists( 'WooCommerce' ) || class_exists( 'WC_Product' );
+	}
+
+	/**
+	 * Check if WooCommerce integration is enabled.
+	 *
+	 * @return bool
+	 */
+	public static function is_enabled(): bool {
+		return 'yes' === get_option( self::OPTION_ENABLED, 'no' );
+	}
+
+	/**
+	 * Enable WooCommerce integration.
+	 *
+	 * @return void
+	 */
+	public static function enable(): void {
+		update_option( self::OPTION_ENABLED, 'yes' );
+	}
+
+	/**
+	 * Disable WooCommerce integration.
+	 *
+	 * @return void
+	 */
+	public static function disable(): void {
+		update_option( self::OPTION_ENABLED, 'no' );
+	}
+
+	/**
+	 * Check if auto-sync products is enabled.
+	 *
+	 * @return bool
+	 */
+	public static function is_auto_sync_enabled(): bool {
+		return 'yes' === get_option( self::OPTION_AUTO_SYNC, 'yes' );
+	}
+
+	/**
+	 * Check if auto-confirm booking is enabled.
+	 *
+	 * @return bool
+	 */
+	public static function is_auto_confirm_enabled(): bool {
+		return 'yes' === get_option( self::OPTION_AUTO_CONFIRM, 'yes' );
+	}
+
+	/**
+	 * Check if invoice attachment is enabled.
+	 *
+	 * @return bool
+	 */
+	public static function is_invoice_attach_enabled(): bool {
+		return 'yes' === get_option( self::OPTION_INVOICE_ATTACH, 'yes' );
+	}
+
+	/**
+	 * Get the WooCommerce product category for rooms.
+	 *
+	 * @return int Product category term ID, or 0 if not set.
+	 */
+	public static function get_product_category(): int {
+		return absint( get_option( self::OPTION_PRODUCT_CATEGORY, 0 ) );
+	}
+
+	/**
+	 * Get invoice number prefix.
+	 *
+	 * @return string
+	 */
+	public static function get_invoice_prefix(): string {
+		return get_option( self::OPTION_INVOICE_PREFIX, 'INV-' );
+	}
+
+	/**
+	 * Get invoice starting number.
+	 *
+	 * @return int
+	 */
+	public static function get_invoice_start_number(): int {
+		return absint( get_option( self::OPTION_INVOICE_START_NUMBER, 1000 ) );
+	}
+
+	/**
+	 * Get and increment the next invoice number.
+	 *
+	 * @return string The next invoice number with prefix.
+	 */
+	public static function get_next_invoice_number(): string {
+		$last_number  = absint( get_option( self::OPTION_INVOICE_LAST_NUMBER, 0 ) );
+		$start_number = self::get_invoice_start_number();
+
+		// Use start number if no invoices generated yet.
+		$next_number = ( 0 === $last_number ) ? $start_number : $last_number + 1;
+
+		// Update the last number.
+		update_option( self::OPTION_INVOICE_LAST_NUMBER, $next_number );
+
+		return self::get_invoice_prefix() . str_pad( (string) $next_number, 5, '0', STR_PAD_LEFT );
+	}
+
+	/**
+	 * Get invoice logo attachment ID.
+	 *
+	 * @return int Attachment ID or 0.
+	 */
+	public static function get_invoice_logo(): int {
+		return absint( get_option( self::OPTION_INVOICE_LOGO, 0 ) );
+	}
+
+	/**
+	 * Get invoice footer text.
+	 *
+	 * @return string
+	 */
+	public static function get_invoice_footer(): string {
+		return get_option( self::OPTION_INVOICE_FOOTER, '' );
+	}
+
+	/**
+	 * Display admin notices.
+	 *
+	 * @return void
+	 */
+	public static function admin_notices(): void {
+		// Show notice if integration enabled but WC not active.
+		if ( self::is_enabled() && ! self::is_wc_active() ) {
+			?>
+			<div class="notice notice-warning is-dismissible">
+				<p>
+					<strong><?php esc_html_e( 'WP BnB:', 'wp-bnb' ); ?></strong>
+					<?php esc_html_e( 'WooCommerce integration is enabled but WooCommerce is not active. Please install and activate WooCommerce or disable the integration in WP BnB settings.', 'wp-bnb' ); ?>
+				</p>
+			</div>
+			<?php
+		}
+	}
+
+	/**
+	 * Map WooCommerce order status to booking status.
+	 *
+	 * @param string $wc_status WooCommerce order status (without 'wc-' prefix).
+	 * @return string Booking status.
+	 */
+	public static function map_wc_status_to_booking( string $wc_status ): string {
+		$map = array(
+			'pending'    => 'pending',
+			'on-hold'    => 'pending',
+			'processing' => self::is_auto_confirm_enabled() ? 'confirmed' : 'pending',
+			'completed'  => 'confirmed',
+			'cancelled'  => 'cancelled',
+			'refunded'   => 'cancelled',
+			'failed'     => 'cancelled',
+		);
+
+		/**
+		 * Filter the WooCommerce to booking status mapping.
+		 *
+		 * @param array $map Status mapping array.
+		 */
+		$map = apply_filters( 'wp_bnb_wc_status_map', $map );
+
+		return $map[ $wc_status ] ?? 'pending';
+	}
+
+	/**
+	 * Map booking status to WooCommerce order status.
+	 *
+	 * @param string $booking_status Booking status.
+	 * @return string WooCommerce order status (without 'wc-' prefix).
+	 */
+	public static function map_booking_status_to_wc( string $booking_status ): string {
+		$map = array(
+			'pending'     => 'on-hold',
+			'confirmed'   => 'processing',
+			'checked_in'  => 'processing',
+			'checked_out' => 'completed',
+			'cancelled'   => 'cancelled',
+		);
+
+		return $map[ $booking_status ] ?? 'on-hold';
+	}
+
+	/**
+	 * Get WooCommerce order for a booking.
+	 *
+	 * @param int $booking_id Booking post ID.
+	 * @return \WC_Order|null WooCommerce order or null.
+	 */
+	public static function get_order_for_booking( int $booking_id ): ?\WC_Order {
+		$order_id = get_post_meta( $booking_id, self::BOOKING_ORDER_META, true );
+
+		if ( ! $order_id ) {
+			return null;
+		}
+
+		$order = wc_get_order( $order_id );
+
+		return $order instanceof \WC_Order ? $order : null;
+	}
+
+	/**
+	 * Get booking ID for a WooCommerce order.
+	 *
+	 * @param \WC_Order|int $order WooCommerce order or order ID.
+	 * @return int|null Booking post ID or null.
+	 */
+	public static function get_booking_for_order( $order ): ?int {
+		if ( is_int( $order ) ) {
+			$order = wc_get_order( $order );
+		}
+
+		if ( ! $order instanceof \WC_Order ) {
+			return null;
+		}
+
+		$booking_id = $order->get_meta( self::ORDER_BOOKING_META, true );
+
+		return $booking_id ? absint( $booking_id ) : null;
+	}
+
+	/**
+	 * Link a booking to a WooCommerce order (bidirectional).
+	 *
+	 * @param int       $booking_id Booking post ID.
+	 * @param \WC_Order $order      WooCommerce order.
+	 * @return void
+	 */
+	public static function link_booking_to_order( int $booking_id, \WC_Order $order ): void {
+		// Store order ID in booking meta.
+		update_post_meta( $booking_id, self::BOOKING_ORDER_META, $order->get_id() );
+
+		// Store booking ID in order meta (HPOS compatible).
+		$order->update_meta_data( self::ORDER_BOOKING_META, $booking_id );
+		$order->save();
+	}
+}

src/Integration/WooCommerce/OrderHandler.php

@@ -0,0 +1,584 @@
+<?php
+/**
+ * WooCommerce Order Handler.
+ *
+ * Handles order-to-booking creation and status synchronization.
+ *
+ * @package Magdev\WpBnb\Integration\WooCommerce
+ */
+
+declare( strict_types=1 );
+
+namespace Magdev\WpBnb\Integration\WooCommerce;
+
+use Magdev\WpBnb\Booking\EmailNotifier;
+use Magdev\WpBnb\PostTypes\Booking;
+use Magdev\WpBnb\PostTypes\Guest;
+use Magdev\WpBnb\PostTypes\Room;
+use Magdev\WpBnb\Pricing\Calculator;
+
+/**
+ * Order Handler class.
+ *
+ * Creates bookings from WooCommerce orders on payment completion
+ * and synchronizes order/booking statuses.
+ */
+final class OrderHandler {
+
+	/**
+	 * Flag to prevent recursive status updates.
+	 *
+	 * @var bool
+	 */
+	private static bool $updating_status = false;
+
+	/**
+	 * Initialize order handler.
+	 *
+	 * @return void
+	 */
+	public static function init(): void {
+		// Create booking on payment completion.
+		add_action( 'woocommerce_payment_complete', array( self::class, 'on_payment_complete' ) );
+
+		// Also handle manual order status changes to processing/completed.
+		add_action( 'woocommerce_order_status_processing', array( self::class, 'on_order_processing' ) );
+		add_action( 'woocommerce_order_status_completed', array( self::class, 'on_order_completed' ) );
+
+		// Sync order status changes to booking.
+		add_action( 'woocommerce_order_status_changed', array( self::class, 'sync_order_status_to_booking' ), 10, 4 );
+
+		// Display booking info in admin order page.
+		add_action( 'woocommerce_admin_order_data_after_billing_address', array( self::class, 'display_booking_info_admin' ) );
+
+		// Display booking info on thank you page.
+		add_action( 'woocommerce_thankyou', array( self::class, 'display_booking_info_thankyou' ) );
+
+		// Display booking info in order details.
+		add_action( 'woocommerce_order_details_after_order_table', array( self::class, 'display_booking_info_order_details' ) );
+	}
+
+	/**
+	 * Handle payment completion.
+	 *
+	 * @param int $order_id Order ID.
+	 * @return void
+	 */
+	public static function on_payment_complete( int $order_id ): void {
+		self::maybe_create_booking( $order_id );
+	}
+
+	/**
+	 * Handle order status change to processing.
+	 *
+	 * @param int $order_id Order ID.
+	 * @return void
+	 */
+	public static function on_order_processing( int $order_id ): void {
+		self::maybe_create_booking( $order_id );
+	}
+
+	/**
+	 * Handle order status change to completed.
+	 *
+	 * @param int $order_id Order ID.
+	 * @return void
+	 */
+	public static function on_order_completed( int $order_id ): void {
+		self::maybe_create_booking( $order_id );
+	}
+
+	/**
+	 * Create booking from order if not already created.
+	 *
+	 * @param int $order_id Order ID.
+	 * @return void
+	 */
+	private static function maybe_create_booking( int $order_id ): void {
+		$order = wc_get_order( $order_id );
+
+		if ( ! $order instanceof \WC_Order ) {
+			return;
+		}
+
+		// Check if booking already created.
+		$existing_booking = Manager::get_booking_for_order( $order );
+
+		if ( $existing_booking ) {
+			return;
+		}
+
+		// Check if order has room bookings.
+		$has_bookings = false;
+		foreach ( $order->get_items() as $item ) {
+			$room_id = $item->get_meta( '_bnb_room_id', true );
+			if ( $room_id ) {
+				$has_bookings = true;
+				break;
+			}
+		}
+
+		if ( ! $has_bookings ) {
+			return;
+		}
+
+		// Create booking.
+		self::create_booking_from_order( $order );
+	}
+
+	/**
+	 * Create booking(s) from WooCommerce order.
+	 *
+	 * @param \WC_Order $order WooCommerce order.
+	 * @return int|null Booking ID or null on failure.
+	 */
+	public static function create_booking_from_order( \WC_Order $order ): ?int {
+		/**
+		 * Fires before creating a booking from an order.
+		 *
+		 * @param \WC_Order $order WooCommerce order.
+		 */
+		do_action( 'wp_bnb_wc_before_booking_from_order', $order );
+
+		// Find or create guest.
+		$guest_id = self::find_or_create_guest( $order );
+
+		// Get booking data from order items.
+		$booking_id = null;
+
+		foreach ( $order->get_items() as $item ) {
+			$room_id = $item->get_meta( '_bnb_room_id', true );
+
+			if ( ! $room_id ) {
+				continue;
+			}
+
+			$check_in   = $item->get_meta( '_bnb_check_in', true );
+			$check_out  = $item->get_meta( '_bnb_check_out', true );
+			$guests     = $item->get_meta( '_bnb_guests', true );
+			$nights     = $item->get_meta( '_bnb_nights', true );
+			$services   = $item->get_meta( '_bnb_services', true );
+			$breakdown  = $item->get_meta( '_bnb_price_breakdown', true );
+
+			// Decode JSON if necessary.
+			if ( is_string( $services ) ) {
+				$services = json_decode( $services, true ) ?: array();
+			}
+			if ( is_string( $breakdown ) ) {
+				$breakdown = json_decode( $breakdown, true ) ?: array();
+			}
+
+			// Determine initial status.
+			$status = Manager::is_auto_confirm_enabled() ? 'confirmed' : 'pending';
+
+			// Get guest notes.
+			$guest_notes = $order->get_meta( '_bnb_guest_notes', true );
+
+			// Create booking post.
+			$booking_data = array(
+				'post_type'   => Booking::POST_TYPE,
+				'post_status' => 'publish',
+				'post_title'  => self::generate_booking_title( $guest_id, $check_in, $check_out ),
+			);
+
+			/**
+			 * Filter the booking data before creation.
+			 *
+			 * @param array     $booking_data Booking post data.
+			 * @param \WC_Order $order        WooCommerce order.
+			 */
+			$booking_data = apply_filters( 'wp_bnb_wc_booking_from_order_data', $booking_data, $order );
+
+			$booking_id = wp_insert_post( $booking_data );
+
+			if ( ! $booking_id || is_wp_error( $booking_id ) ) {
+				continue;
+			}
+
+			// Store booking meta.
+			update_post_meta( $booking_id, '_bnb_booking_room_id', $room_id );
+			update_post_meta( $booking_id, '_bnb_booking_check_in', $check_in );
+			update_post_meta( $booking_id, '_bnb_booking_check_out', $check_out );
+			update_post_meta( $booking_id, '_bnb_booking_status', $status );
+			update_post_meta( $booking_id, '_bnb_booking_adults', max( 1, (int) $guests ) );
+			update_post_meta( $booking_id, '_bnb_booking_children', 0 );
+			update_post_meta( $booking_id, '_bnb_booking_guest_notes', $guest_notes );
+			update_post_meta( $booking_id, '_bnb_booking_source', 'woocommerce_order_' . $order->get_id() );
+
+			// Store guest info.
+			if ( $guest_id ) {
+				update_post_meta( $booking_id, '_bnb_booking_guest_id', $guest_id );
+				update_post_meta( $booking_id, '_bnb_booking_guest_name', Guest::get_full_name( $guest_id ) );
+				update_post_meta( $booking_id, '_bnb_booking_guest_email', get_post_meta( $guest_id, '_bnb_guest_email', true ) );
+				update_post_meta( $booking_id, '_bnb_booking_guest_phone', get_post_meta( $guest_id, '_bnb_guest_phone', true ) );
+			} else {
+				// Use order billing info.
+				$guest_name = $order->get_billing_first_name() . ' ' . $order->get_billing_last_name();
+				update_post_meta( $booking_id, '_bnb_booking_guest_name', $guest_name );
+				update_post_meta( $booking_id, '_bnb_booking_guest_email', $order->get_billing_email() );
+				update_post_meta( $booking_id, '_bnb_booking_guest_phone', $order->get_billing_phone() );
+			}
+
+			// Store pricing.
+			$total = $item->get_total();
+			update_post_meta( $booking_id, '_bnb_booking_calculated_price', $total );
+
+			if ( ! empty( $breakdown ) ) {
+				update_post_meta( $booking_id, '_bnb_booking_price_breakdown', $breakdown );
+			}
+
+			// Store services.
+			if ( ! empty( $services ) ) {
+				update_post_meta( $booking_id, Booking::SERVICES_META_KEY, $services );
+			}
+
+			// Generate booking reference.
+			$reference = self::generate_booking_reference( $booking_id );
+			update_post_meta( $booking_id, '_bnb_booking_reference', $reference );
+
+			// Store confirmed timestamp if auto-confirmed.
+			if ( 'confirmed' === $status ) {
+				update_post_meta( $booking_id, '_bnb_booking_confirmed_at', current_time( 'mysql' ) );
+			}
+
+			// Link booking to order.
+			Manager::link_booking_to_order( $booking_id, $order );
+
+			// Also store room ID in order meta for quick access.
+			$order->update_meta_data( Manager::ORDER_ROOM_META, $room_id );
+
+			// Store check-in/out in order meta.
+			$order->update_meta_data( '_bnb_check_in', $check_in );
+			$order->update_meta_data( '_bnb_check_out', $check_out );
+			$order->save();
+
+			// Trigger status change action for email notifications.
+			if ( 'confirmed' === $status ) {
+				/**
+				 * Fires when booking status changes (for email notifications).
+				 *
+				 * @param int    $booking_id Booking post ID.
+				 * @param string $old_status Old status.
+				 * @param string $new_status New status.
+				 */
+				do_action( 'wp_bnb_booking_status_changed', $booking_id, 'pending', 'confirmed' );
+			}
+		}
+
+		/**
+		 * Fires after creating a booking from an order.
+		 *
+		 * @param int|null  $booking_id Last booking ID created.
+		 * @param \WC_Order $order      WooCommerce order.
+		 */
+		do_action( 'wp_bnb_wc_after_booking_from_order', $booking_id, $order );
+
+		return $booking_id;
+	}
+
+	/**
+	 * Sync order status changes to booking status.
+	 *
+	 * @param int       $order_id   Order ID.
+	 * @param string    $old_status Old status.
+	 * @param string    $new_status New status.
+	 * @param \WC_Order $order      Order object.
+	 * @return void
+	 */
+	public static function sync_order_status_to_booking( int $order_id, string $old_status, string $new_status, \WC_Order $order ): void {
+		// Prevent recursive updates.
+		if ( self::$updating_status ) {
+			return;
+		}
+
+		$booking_id = Manager::get_booking_for_order( $order );
+
+		if ( ! $booking_id ) {
+			return;
+		}
+
+		// Map WC status to booking status.
+		$booking_status = Manager::map_wc_status_to_booking( $new_status );
+
+		// Get current booking status.
+		$current_booking_status = get_post_meta( $booking_id, '_bnb_booking_status', true );
+
+		// Don't update if status is the same.
+		if ( $current_booking_status === $booking_status ) {
+			return;
+		}
+
+		// Don't downgrade from checked_in/checked_out.
+		if ( in_array( $current_booking_status, array( 'checked_in', 'checked_out' ), true ) ) {
+			return;
+		}
+
+		self::$updating_status = true;
+
+		// Update booking status.
+		update_post_meta( $booking_id, '_bnb_booking_status', $booking_status );
+
+		// Update confirmed timestamp if confirming.
+		if ( 'confirmed' === $booking_status && 'pending' === $current_booking_status ) {
+			update_post_meta( $booking_id, '_bnb_booking_confirmed_at', current_time( 'mysql' ) );
+		}
+
+		// Trigger booking status changed action.
+		do_action( 'wp_bnb_booking_status_changed', $booking_id, $current_booking_status, $booking_status );
+
+		self::$updating_status = false;
+	}
+
+	/**
+	 * Find or create guest from order data.
+	 *
+	 * @param \WC_Order $order WooCommerce order.
+	 * @return int|null Guest ID or null.
+	 */
+	private static function find_or_create_guest( \WC_Order $order ): ?int {
+		$email = $order->get_billing_email();
+
+		if ( ! $email ) {
+			return null;
+		}
+
+		// Try to find existing guest by email.
+		$existing_guests = get_posts(
+			array(
+				'post_type'      => Guest::POST_TYPE,
+				'posts_per_page' => 1,
+				'post_status'    => 'publish',
+				'meta_query'     => array(
+					array(
+						'key'   => '_bnb_guest_email',
+						'value' => $email,
+					),
+				),
+			)
+		);
+
+		if ( ! empty( $existing_guests ) ) {
+			return $existing_guests[0]->ID;
+		}
+
+		// Create new guest.
+		$first_name = $order->get_billing_first_name();
+		$last_name  = $order->get_billing_last_name();
+		$full_name  = trim( $first_name . ' ' . $last_name );
+
+		$guest_data = array(
+			'post_type'   => Guest::POST_TYPE,
+			'post_status' => 'publish',
+			'post_title'  => $full_name ?: $email,
+		);
+
+		$guest_id = wp_insert_post( $guest_data );
+
+		if ( ! $guest_id || is_wp_error( $guest_id ) ) {
+			return null;
+		}
+
+		// Store guest meta.
+		update_post_meta( $guest_id, '_bnb_guest_first_name', $first_name );
+		update_post_meta( $guest_id, '_bnb_guest_last_name', $last_name );
+		update_post_meta( $guest_id, '_bnb_guest_email', $email );
+		update_post_meta( $guest_id, '_bnb_guest_phone', $order->get_billing_phone() );
+		update_post_meta( $guest_id, '_bnb_guest_address', $order->get_billing_address_1() );
+		update_post_meta( $guest_id, '_bnb_guest_city', $order->get_billing_city() );
+		update_post_meta( $guest_id, '_bnb_guest_postal_code', $order->get_billing_postcode() );
+		update_post_meta( $guest_id, '_bnb_guest_country', $order->get_billing_country() );
+		update_post_meta( $guest_id, '_bnb_guest_status', 'active' );
+		update_post_meta( $guest_id, '_bnb_guest_source', 'woocommerce' );
+
+		return $guest_id;
+	}
+
+	/**
+	 * Generate booking title.
+	 *
+	 * @param int|null $guest_id  Guest ID.
+	 * @param string   $check_in  Check-in date.
+	 * @param string   $check_out Check-out date.
+	 * @return string Booking title.
+	 */
+	private static function generate_booking_title( ?int $guest_id, string $check_in, string $check_out ): string {
+		$guest_name = $guest_id ? Guest::get_full_name( $guest_id ) : __( 'Guest', 'wp-bnb' );
+
+		$check_in_date  = \DateTime::createFromFormat( 'Y-m-d', $check_in );
+		$check_out_date = \DateTime::createFromFormat( 'Y-m-d', $check_out );
+
+		if ( ! $check_in_date || ! $check_out_date ) {
+			return $guest_name;
+		}
+
+		// Format: "Guest Name (DD.MM - DD.MM.YYYY)" or span years.
+		if ( $check_in_date->format( 'Y' ) === $check_out_date->format( 'Y' ) ) {
+			return sprintf(
+				'%s (%s - %s)',
+				$guest_name,
+				$check_in_date->format( 'd.m' ),
+				$check_out_date->format( 'd.m.Y' )
+			);
+		}
+
+		return sprintf(
+			'%s (%s - %s)',
+			$guest_name,
+			$check_in_date->format( 'd.m.Y' ),
+			$check_out_date->format( 'd.m.Y' )
+		);
+	}
+
+	/**
+	 * Generate booking reference.
+	 *
+	 * @param int $booking_id Booking ID.
+	 * @return string Booking reference.
+	 */
+	private static function generate_booking_reference( int $booking_id ): string {
+		return sprintf(
+			'BNB-%s-%05d',
+			gmdate( 'Y' ),
+			$booking_id
+		);
+	}
+
+	/**
+	 * Display booking info in admin order page.
+	 *
+	 * @param \WC_Order $order WooCommerce order.
+	 * @return void
+	 */
+	public static function display_booking_info_admin( \WC_Order $order ): void {
+		$booking_id = Manager::get_booking_for_order( $order );
+
+		if ( ! $booking_id ) {
+			return;
+		}
+
+		$booking = get_post( $booking_id );
+		$status  = get_post_meta( $booking_id, '_bnb_booking_status', true );
+		$room_id = get_post_meta( $booking_id, '_bnb_booking_room_id', true );
+		$room    = $room_id ? get_post( $room_id ) : null;
+		?>
+		<div class="order_data_column bnb-order-booking-info">
+			<h3><?php esc_html_e( 'Booking Information', 'wp-bnb' ); ?></h3>
+			<p>
+				<strong><?php esc_html_e( 'Booking:', 'wp-bnb' ); ?></strong>
+				<a href="<?php echo esc_url( get_edit_post_link( $booking_id ) ); ?>">
+					<?php echo esc_html( $booking ? $booking->post_title : "#{$booking_id}" ); ?>
+				</a>
+			</p>
+			<?php if ( $room ) : ?>
+				<p>
+					<strong><?php esc_html_e( 'Room:', 'wp-bnb' ); ?></strong>
+					<a href="<?php echo esc_url( get_edit_post_link( $room_id ) ); ?>">
+						<?php echo esc_html( $room->post_title ); ?>
+					</a>
+				</p>
+			<?php endif; ?>
+			<p>
+				<strong><?php esc_html_e( 'Status:', 'wp-bnb' ); ?></strong>
+				<span class="bnb-status-badge bnb-status-<?php echo esc_attr( $status ); ?>">
+					<?php echo esc_html( ucfirst( str_replace( '_', ' ', $status ) ) ); ?>
+				</span>
+			</p>
+		</div>
+		<?php
+	}
+
+	/**
+	 * Display booking info on thank you page.
+	 *
+	 * @param int $order_id Order ID.
+	 * @return void
+	 */
+	public static function display_booking_info_thankyou( int $order_id ): void {
+		$order = wc_get_order( $order_id );
+
+		if ( ! $order ) {
+			return;
+		}
+
+		$booking_id = Manager::get_booking_for_order( $order );
+
+		if ( ! $booking_id ) {
+			return;
+		}
+
+		$reference = get_post_meta( $booking_id, '_bnb_booking_reference', true );
+		$check_in  = get_post_meta( $booking_id, '_bnb_booking_check_in', true );
+		$check_out = get_post_meta( $booking_id, '_bnb_booking_check_out', true );
+		$room_id   = get_post_meta( $booking_id, '_bnb_booking_room_id', true );
+		$room      = $room_id ? get_post( $room_id ) : null;
+		$building  = $room_id ? Room::get_building( $room_id ) : null;
+
+		$date_format    = get_option( 'date_format' );
+		$check_in_date  = \DateTime::createFromFormat( 'Y-m-d', $check_in );
+		$check_out_date = \DateTime::createFromFormat( 'Y-m-d', $check_out );
+		?>
+		<section class="woocommerce-booking-confirmation">
+			<h2><?php esc_html_e( 'Booking Confirmed', 'wp-bnb' ); ?></h2>
+			<table class="woocommerce-table woocommerce-table--booking-details">
+				<tbody>
+					<tr>
+						<th><?php esc_html_e( 'Booking Reference:', 'wp-bnb' ); ?></th>
+						<td><strong><?php echo esc_html( $reference ); ?></strong></td>
+					</tr>
+					<?php if ( $room ) : ?>
+						<tr>
+							<th><?php esc_html_e( 'Room:', 'wp-bnb' ); ?></th>
+							<td>
+								<?php echo esc_html( $room->post_title ); ?>
+								<?php if ( $building ) : ?>
+									<br><small><?php echo esc_html( $building->post_title ); ?></small>
+								<?php endif; ?>
+							</td>
+						</tr>
+					<?php endif; ?>
+					<tr>
+						<th><?php esc_html_e( 'Check-in:', 'wp-bnb' ); ?></th>
+						<td><?php echo esc_html( $check_in_date ? $check_in_date->format( $date_format ) : $check_in ); ?></td>
+					</tr>
+					<tr>
+						<th><?php esc_html_e( 'Check-out:', 'wp-bnb' ); ?></th>
+						<td><?php echo esc_html( $check_out_date ? $check_out_date->format( $date_format ) : $check_out ); ?></td>
+					</tr>
+				</tbody>
+			</table>
+			<p class="woocommerce-notice woocommerce-notice--success">
+				<?php esc_html_e( 'Your booking has been confirmed. A confirmation email has been sent to your email address.', 'wp-bnb' ); ?>
+			</p>
+		</section>
+		<?php
+	}
+
+	/**
+	 * Display booking info in order details (customer account).
+	 *
+	 * @param \WC_Order $order WooCommerce order.
+	 * @return void
+	 */
+	public static function display_booking_info_order_details( \WC_Order $order ): void {
+		$booking_id = Manager::get_booking_for_order( $order );
+
+		if ( ! $booking_id ) {
+			return;
+		}
+
+		$reference = get_post_meta( $booking_id, '_bnb_booking_reference', true );
+		$status    = get_post_meta( $booking_id, '_bnb_booking_status', true );
+
+		if ( $reference ) {
+			?>
+			<p class="woocommerce-booking-reference">
+				<strong><?php esc_html_e( 'Booking Reference:', 'wp-bnb' ); ?></strong>
+				<?php echo esc_html( $reference ); ?>
+				<span class="bnb-status-badge bnb-status-<?php echo esc_attr( $status ); ?>">
+					<?php echo esc_html( ucfirst( str_replace( '_', ' ', $status ) ) ); ?>
+				</span>
+			</p>
+			<?php
+		}
+	}
+}

src/Integration/WooCommerce/ProductSync.php

@@ -0,0 +1,515 @@
+<?php
+/**
+ * WooCommerce Product Synchronization.
+ *
+ * Synchronizes rooms with WooCommerce products.
+ *
+ * @package Magdev\WpBnb\Integration\WooCommerce
+ */
+
+declare( strict_types=1 );
+
+namespace Magdev\WpBnb\Integration\WooCommerce;
+
+use Magdev\WpBnb\PostTypes\Building;
+use Magdev\WpBnb\PostTypes\Room;
+use Magdev\WpBnb\Pricing\Calculator;
+use Magdev\WpBnb\Pricing\PricingTier;
+use Magdev\WpBnb\Taxonomies\Amenity;
+use Magdev\WpBnb\Taxonomies\RoomType;
+
+/**
+ * Product Synchronization class.
+ *
+ * Creates and maintains WooCommerce products that correspond to BnB rooms.
+ */
+final class ProductSync {
+
+	/**
+	 * Initialize product synchronization.
+	 *
+	 * @return void
+	 */
+	public static function init(): void {
+		// Sync product when room is saved.
+		add_action( 'save_post_' . Room::POST_TYPE, array( self::class, 'on_room_save' ), 20, 2 );
+
+		// Delete product when room is deleted.
+		add_action( 'before_delete_post', array( self::class, 'on_room_delete' ) );
+
+		// Add linked room info to product edit screen.
+		add_action( 'woocommerce_product_options_general_product_data', array( self::class, 'add_product_room_info' ) );
+
+		// AJAX handler for syncing all rooms.
+		add_action( 'wp_ajax_wp_bnb_sync_all_rooms', array( self::class, 'ajax_sync_all_rooms' ) );
+	}
+
+	/**
+	 * Handle room save - create or update product.
+	 *
+	 * @param int      $post_id Post ID.
+	 * @param \WP_Post $post    Post object.
+	 * @return void
+	 */
+	public static function on_room_save( int $post_id, \WP_Post $post ): void {
+		// Skip autosaves, revisions, and other non-published posts.
+		if ( wp_is_post_autosave( $post_id ) || wp_is_post_revision( $post_id ) ) {
+			return;
+		}
+
+		if ( 'publish' !== $post->post_status ) {
+			return;
+		}
+
+		// Check if auto-sync is enabled.
+		if ( ! Manager::is_auto_sync_enabled() ) {
+			return;
+		}
+
+		// Sync the product.
+		self::sync_room_to_product( $post_id );
+	}
+
+	/**
+	 * Handle room deletion - delete linked product.
+	 *
+	 * @param int $post_id Post ID.
+	 * @return void
+	 */
+	public static function on_room_delete( int $post_id ): void {
+		$post = get_post( $post_id );
+
+		if ( ! $post || Room::POST_TYPE !== $post->post_type ) {
+			return;
+		}
+
+		self::delete_product_for_room( $post_id );
+	}
+
+	/**
+	 * Sync a room to a WooCommerce product.
+	 *
+	 * Creates a new product if one doesn't exist, or updates existing one.
+	 *
+	 * @param int $room_id Room post ID.
+	 * @return int|null Product ID or null on failure.
+	 */
+	public static function sync_room_to_product( int $room_id ): ?int {
+		$room = get_post( $room_id );
+
+		if ( ! $room || Room::POST_TYPE !== $room->post_type ) {
+			return null;
+		}
+
+		// Check for existing product.
+		$product_id = self::get_product_for_room( $room_id );
+
+		if ( $product_id ) {
+			// Update existing product.
+			return self::update_product( $product_id, $room );
+		}
+
+		// Create new product.
+		return self::create_product_for_room( $room );
+	}
+
+	/**
+	 * Create a WooCommerce product for a room.
+	 *
+	 * @param \WP_Post $room Room post object.
+	 * @return int|null Product ID or null on failure.
+	 */
+	public static function create_product_for_room( \WP_Post $room ): ?int {
+		/**
+		 * Fires before creating a WC product for a room.
+		 *
+		 * @param int $room_id Room post ID.
+		 */
+		do_action( 'wp_bnb_wc_before_product_sync', $room->ID );
+
+		// Create a simple virtual product.
+		$product = new \WC_Product_Simple();
+
+		// Configure the product.
+		self::configure_product( $product, $room );
+
+		// Save the product.
+		$product_id = $product->save();
+
+		if ( ! $product_id ) {
+			return null;
+		}
+
+		// Store bidirectional links.
+		update_post_meta( $room->ID, Manager::ROOM_PRODUCT_META, $product_id );
+		update_post_meta( $product_id, Manager::PRODUCT_ROOM_META, $room->ID );
+
+		/**
+		 * Fires after creating a WC product for a room.
+		 *
+		 * @param int $room_id    Room post ID.
+		 * @param int $product_id WC product ID.
+		 */
+		do_action( 'wp_bnb_wc_after_product_sync', $room->ID, $product_id );
+
+		return $product_id;
+	}
+
+	/**
+	 * Update an existing WooCommerce product.
+	 *
+	 * @param int      $product_id Product ID.
+	 * @param \WP_Post $room       Room post object.
+	 * @return int|null Product ID or null on failure.
+	 */
+	private static function update_product( int $product_id, \WP_Post $room ): ?int {
+		$product = wc_get_product( $product_id );
+
+		if ( ! $product ) {
+			// Product was deleted, create a new one.
+			return self::create_product_for_room( $room );
+		}
+
+		/**
+		 * Fires before updating a WC product for a room.
+		 *
+		 * @param int $room_id Room post ID.
+		 */
+		do_action( 'wp_bnb_wc_before_product_sync', $room->ID );
+
+		// Configure the product.
+		self::configure_product( $product, $room );
+
+		// Save the product.
+		$product->save();
+
+		/**
+		 * Fires after updating a WC product for a room.
+		 *
+		 * @param int $room_id    Room post ID.
+		 * @param int $product_id WC product ID.
+		 */
+		do_action( 'wp_bnb_wc_after_product_sync', $room->ID, $product_id );
+
+		return $product_id;
+	}
+
+	/**
+	 * Configure a WooCommerce product from room data.
+	 *
+	 * @param \WC_Product $product Product object.
+	 * @param \WP_Post    $room    Room post object.
+	 * @return void
+	 */
+	private static function configure_product( \WC_Product $product, \WP_Post $room ): void {
+		// Get room data.
+		$building     = Room::get_building( $room->ID );
+		$building_name = $building ? $building->post_title : '';
+		$pricing      = Calculator::getRoomPricing( $room->ID );
+
+		// Basic info.
+		$product->set_name( $room->post_title );
+		$product->set_slug( 'bnb-room-' . $room->ID );
+		$product->set_status( 'publish' );
+
+		// SKU.
+		$product->set_sku( 'bnb-room-' . $room->ID );
+
+		// Virtual product (no shipping).
+		$product->set_virtual( true );
+
+		// Description.
+		$description = $room->post_content;
+		if ( $building_name ) {
+			$description = sprintf(
+				/* translators: %s: Building name */
+				__( 'Room at %s', 'wp-bnb' ),
+				$building_name
+			) . "\n\n" . $description;
+		}
+		$product->set_description( $description );
+		$product->set_short_description( $room->post_excerpt ?: wp_trim_words( $room->post_content, 30 ) );
+
+		// Price (use short-term/nightly rate as base).
+		$base_price = $pricing[ PricingTier::SHORT_TERM->value ]['price'] ?? 0;
+		if ( $base_price > 0 ) {
+			$product->set_regular_price( (string) $base_price );
+		}
+
+		// Featured image.
+		$thumbnail_id = get_post_thumbnail_id( $room->ID );
+		if ( $thumbnail_id ) {
+			$product->set_image_id( $thumbnail_id );
+		}
+
+		// Gallery images.
+		$gallery_ids = get_post_meta( $room->ID, '_bnb_room_gallery', true );
+		if ( $gallery_ids ) {
+			$ids = array_filter( explode( ',', $gallery_ids ), 'is_numeric' );
+			$product->set_gallery_image_ids( array_map( 'absint', $ids ) );
+		}
+
+		// Stock management (disabled - availability handled by booking system).
+		$product->set_manage_stock( false );
+		$product->set_stock_status( 'instock' );
+
+		// Catalog visibility - visible.
+		$product->set_catalog_visibility( 'visible' );
+
+		// Product category.
+		$category_id = Manager::get_product_category();
+		if ( $category_id ) {
+			$product->set_category_ids( array( $category_id ) );
+		}
+
+		// Store room metadata.
+		$capacity = get_post_meta( $room->ID, '_bnb_room_capacity', true );
+		$beds     = get_post_meta( $room->ID, '_bnb_room_beds', true );
+
+		$product->update_meta_data( '_bnb_room_capacity', $capacity );
+		$product->update_meta_data( '_bnb_room_beds', $beds );
+		$product->update_meta_data( '_bnb_building_id', $building ? $building->ID : 0 );
+		$product->update_meta_data( '_bnb_building_name', $building_name );
+
+		/**
+		 * Filter the product data before save.
+		 *
+		 * @param array    $data    Product data array.
+		 * @param int      $room_id Room post ID.
+		 * @param \WP_Post $room    Room post object.
+		 */
+		$data = apply_filters(
+			'wp_bnb_wc_product_data',
+			array(
+				'name'        => $product->get_name(),
+				'price'       => $product->get_regular_price(),
+				'description' => $product->get_description(),
+			),
+			$room->ID,
+			$room
+		);
+
+		// Apply filtered data.
+		if ( isset( $data['name'] ) ) {
+			$product->set_name( $data['name'] );
+		}
+		if ( isset( $data['price'] ) ) {
+			$product->set_regular_price( (string) $data['price'] );
+		}
+		if ( isset( $data['description'] ) ) {
+			$product->set_description( $data['description'] );
+		}
+	}
+
+	/**
+	 * Delete the WooCommerce product for a room.
+	 *
+	 * @param int $room_id Room post ID.
+	 * @return bool True if deleted, false otherwise.
+	 */
+	public static function delete_product_for_room( int $room_id ): bool {
+		$product_id = self::get_product_for_room( $room_id );
+
+		if ( ! $product_id ) {
+			return false;
+		}
+
+		$product = wc_get_product( $product_id );
+
+		if ( ! $product ) {
+			return false;
+		}
+
+		// Delete the product (force delete, not trash).
+		$product->delete( true );
+
+		// Clean up room meta.
+		delete_post_meta( $room_id, Manager::ROOM_PRODUCT_META );
+
+		return true;
+	}
+
+	/**
+	 * Get the WooCommerce product ID for a room.
+	 *
+	 * @param int $room_id Room post ID.
+	 * @return int|null Product ID or null.
+	 */
+	public static function get_product_for_room( int $room_id ): ?int {
+		$product_id = get_post_meta( $room_id, Manager::ROOM_PRODUCT_META, true );
+
+		if ( ! $product_id ) {
+			return null;
+		}
+
+		// Verify product still exists.
+		$product = wc_get_product( $product_id );
+
+		if ( ! $product ) {
+			// Clean up stale meta.
+			delete_post_meta( $room_id, Manager::ROOM_PRODUCT_META );
+			return null;
+		}
+
+		return absint( $product_id );
+	}
+
+	/**
+	 * Get the room ID for a WooCommerce product.
+	 *
+	 * @param int $product_id Product ID.
+	 * @return int|null Room ID or null.
+	 */
+	public static function get_room_for_product( int $product_id ): ?int {
+		$room_id = get_post_meta( $product_id, Manager::PRODUCT_ROOM_META, true );
+
+		if ( ! $room_id ) {
+			return null;
+		}
+
+		// Verify room still exists.
+		$room = get_post( $room_id );
+
+		if ( ! $room || Room::POST_TYPE !== $room->post_type ) {
+			// Clean up stale meta.
+			delete_post_meta( $product_id, Manager::PRODUCT_ROOM_META );
+			return null;
+		}
+
+		return absint( $room_id );
+	}
+
+	/**
+	 * Sync all published rooms to WooCommerce products.
+	 *
+	 * @return array{created: int, updated: int, errors: array<string>}
+	 */
+	public static function sync_all_rooms(): array {
+		$result = array(
+			'created' => 0,
+			'updated' => 0,
+			'errors'  => array(),
+		);
+
+		$rooms = get_posts(
+			array(
+				'post_type'      => Room::POST_TYPE,
+				'post_status'    => 'publish',
+				'posts_per_page' => -1,
+				'fields'         => 'ids',
+			)
+		);
+
+		foreach ( $rooms as $room_id ) {
+			$existing_product = self::get_product_for_room( $room_id );
+
+			$product_id = self::sync_room_to_product( $room_id );
+
+			if ( $product_id ) {
+				if ( $existing_product ) {
+					++$result['updated'];
+				} else {
+					++$result['created'];
+				}
+			} else {
+				$room = get_post( $room_id );
+				$result['errors'][] = sprintf(
+					/* translators: %s: Room title */
+					__( 'Failed to sync room: %s', 'wp-bnb' ),
+					$room ? $room->post_title : "#{$room_id}"
+				);
+			}
+		}
+
+		return $result;
+	}
+
+	/**
+	 * AJAX handler for syncing all rooms.
+	 *
+	 * @return void
+	 */
+	public static function ajax_sync_all_rooms(): void {
+		check_ajax_referer( 'wp_bnb_admin_nonce', 'nonce' );
+
+		if ( ! current_user_can( 'manage_options' ) ) {
+			wp_send_json_error( array( 'message' => __( 'Permission denied.', 'wp-bnb' ) ) );
+		}
+
+		$result = self::sync_all_rooms();
+
+		wp_send_json_success(
+			array(
+				'message' => sprintf(
+					/* translators: 1: Created count, 2: Updated count */
+					__( 'Sync complete. Created: %1$d, Updated: %2$d', 'wp-bnb' ),
+					$result['created'],
+					$result['updated']
+				),
+				'created' => $result['created'],
+				'updated' => $result['updated'],
+				'errors'  => $result['errors'],
+			)
+		);
+	}
+
+	/**
+	 * Add linked room info to WooCommerce product edit screen.
+	 *
+	 * @return void
+	 */
+	public static function add_product_room_info(): void {
+		global $post;
+
+		if ( ! $post ) {
+			return;
+		}
+
+		$room_id = self::get_room_for_product( $post->ID );
+
+		if ( ! $room_id ) {
+			return;
+		}
+
+		$room = get_post( $room_id );
+
+		if ( ! $room ) {
+			return;
+		}
+
+		?>
+		<div class="options_group show_if_simple">
+			<p class="form-field">
+				<label><?php esc_html_e( 'Linked BnB Room', 'wp-bnb' ); ?></label>
+				<span class="description">
+					<a href="<?php echo esc_url( get_edit_post_link( $room_id ) ); ?>">
+						<?php echo esc_html( $room->post_title ); ?>
+					</a>
+					<br>
+					<small><?php esc_html_e( 'This product is automatically synced from the linked room. Changes should be made in the room settings.', 'wp-bnb' ); ?></small>
+				</span>
+			</p>
+		</div>
+		<?php
+	}
+
+	/**
+	 * Check if a product is a BnB room product.
+	 *
+	 * @param int|\WC_Product $product Product ID or object.
+	 * @return bool
+	 */
+	public static function is_room_product( $product ): bool {
+		if ( is_int( $product ) ) {
+			$product = wc_get_product( $product );
+		}
+
+		if ( ! $product instanceof \WC_Product ) {
+			return false;
+		}
+
+		$room_id = $product->get_meta( Manager::PRODUCT_ROOM_META, true );
+
+		return ! empty( $room_id );
+	}
+}

src/Integration/WooCommerce/RefundHandler.php

@@ -0,0 +1,394 @@
+<?php
+/**
+ * WooCommerce Refund Handler.
+ *
+ * Handles refund processing and booking cancellation.
+ *
+ * @package Magdev\WpBnb\Integration\WooCommerce
+ */
+
+declare( strict_types=1 );
+
+namespace Magdev\WpBnb\Integration\WooCommerce;
+
+use Magdev\WpBnb\Booking\EmailNotifier;
+use Magdev\WpBnb\PostTypes\Booking;
+
+/**
+ * Refund Handler class.
+ *
+ * Processes refunds and updates booking status accordingly.
+ */
+final class RefundHandler {
+
+	/**
+	 * Booking meta key for refund amount.
+	 */
+	public const REFUND_AMOUNT_META = '_bnb_booking_refund_amount';
+
+	/**
+	 * Booking meta key for refund reason.
+	 */
+	public const REFUND_REASON_META = '_bnb_booking_refund_reason';
+
+	/**
+	 * Booking meta key for refund date.
+	 */
+	public const REFUND_DATE_META = '_bnb_booking_refund_date';
+
+	/**
+	 * Initialize refund handler.
+	 *
+	 * @return void
+	 */
+	public static function init(): void {
+		// Handle refund creation.
+		add_action( 'woocommerce_refund_created', array( self::class, 'on_refund_created' ), 10, 2 );
+
+		// Handle order fully refunded.
+		add_action( 'woocommerce_order_fully_refunded', array( self::class, 'on_order_fully_refunded' ), 10, 2 );
+
+		// Add refund notice in admin order page.
+		add_action( 'woocommerce_admin_order_totals_after_refunded', array( self::class, 'add_booking_refund_notice' ) );
+	}
+
+	/**
+	 * Handle refund creation.
+	 *
+	 * @param int   $refund_id Refund ID.
+	 * @param array $args      Refund arguments.
+	 * @return void
+	 */
+	public static function on_refund_created( int $refund_id, array $args ): void {
+		$order_id = $args['order_id'] ?? 0;
+
+		if ( ! $order_id ) {
+			return;
+		}
+
+		$order = wc_get_order( $order_id );
+
+		if ( ! $order instanceof \WC_Order ) {
+			return;
+		}
+
+		// Check if order has a linked booking.
+		$booking_id = Manager::get_booking_for_order( $order );
+
+		if ( ! $booking_id ) {
+			return;
+		}
+
+		$refund_amount = abs( floatval( $args['amount'] ?? 0 ) );
+		$refund_reason = $args['reason'] ?? '';
+
+		/**
+		 * Fires before processing a refund for a booking.
+		 *
+		 * @param \WC_Order $order         WooCommerce order.
+		 * @param float     $refund_amount Refund amount.
+		 */
+		do_action( 'wp_bnb_wc_before_refund_process', $order, $refund_amount );
+
+		// Check if this is a full or partial refund.
+		$is_full_refund = self::is_full_refund( $order );
+
+		if ( $is_full_refund ) {
+			// Full refund - cancel the booking.
+			self::cancel_booking_on_refund( $booking_id, $refund_amount, $refund_reason );
+		} else {
+			// Partial refund - store refund info but don't cancel.
+			self::record_partial_refund( $booking_id, $refund_amount, $refund_reason );
+		}
+
+		/**
+		 * Fires after processing a refund for a booking.
+		 *
+		 * @param \WC_Order $order         WooCommerce order.
+		 * @param int       $booking_id    Booking ID.
+		 * @param bool      $cancelled     Whether booking was cancelled.
+		 */
+		do_action( 'wp_bnb_wc_after_refund_process', $order, $booking_id, $is_full_refund );
+	}
+
+	/**
+	 * Handle order fully refunded.
+	 *
+	 * @param int $order_id  Order ID.
+	 * @param int $refund_id Refund ID.
+	 * @return void
+	 */
+	public static function on_order_fully_refunded( int $order_id, int $refund_id ): void {
+		$order = wc_get_order( $order_id );
+
+		if ( ! $order instanceof \WC_Order ) {
+			return;
+		}
+
+		$booking_id = Manager::get_booking_for_order( $order );
+
+		if ( ! $booking_id ) {
+			return;
+		}
+
+		// Get current booking status.
+		$current_status = get_post_meta( $booking_id, '_bnb_booking_status', true );
+
+		// Don't cancel if already cancelled.
+		if ( 'cancelled' === $current_status ) {
+			return;
+		}
+
+		// Cancel the booking.
+		$total_refunded = $order->get_total_refunded();
+		self::cancel_booking_on_refund( $booking_id, $total_refunded, __( 'Order fully refunded', 'wp-bnb' ) );
+	}
+
+	/**
+	 * Check if the order is fully refunded.
+	 *
+	 * @param \WC_Order $order WooCommerce order.
+	 * @return bool
+	 */
+	public static function is_full_refund( \WC_Order $order ): bool {
+		$order_total    = floatval( $order->get_total() );
+		$total_refunded = floatval( $order->get_total_refunded() );
+
+		// Consider it full refund if refunded amount >= order total.
+		return $total_refunded >= $order_total;
+	}
+
+	/**
+	 * Cancel booking on full refund.
+	 *
+	 * @param int    $booking_id    Booking ID.
+	 * @param float  $refund_amount Refund amount.
+	 * @param string $reason        Refund reason.
+	 * @return void
+	 */
+	public static function cancel_booking_on_refund( int $booking_id, float $refund_amount, string $reason ): void {
+		// Get current status.
+		$old_status = get_post_meta( $booking_id, '_bnb_booking_status', true );
+
+		// Don't cancel if already cancelled.
+		if ( 'cancelled' === $old_status ) {
+			// Just update refund info.
+			self::record_refund_meta( $booking_id, $refund_amount, $reason );
+			return;
+		}
+
+		/**
+		 * Filter whether to cancel booking on refund.
+		 *
+		 * @param bool      $cancel        Whether to cancel.
+		 * @param \WC_Order $order         WooCommerce order.
+		 * @param float     $refund_amount Refund amount.
+		 */
+		$should_cancel = apply_filters( 'wp_bnb_wc_should_cancel_on_refund', true, $booking_id, $refund_amount );
+
+		if ( ! $should_cancel ) {
+			self::record_partial_refund( $booking_id, $refund_amount, $reason );
+			return;
+		}
+
+		// Update booking status to cancelled.
+		update_post_meta( $booking_id, '_bnb_booking_status', 'cancelled' );
+
+		// Store refund information.
+		self::record_refund_meta( $booking_id, $refund_amount, $reason );
+
+		// Add cancellation note.
+		$note = sprintf(
+			/* translators: %s: Refund amount */
+			__( 'Booking cancelled due to WooCommerce refund (%s)', 'wp-bnb' ),
+			wc_price( $refund_amount )
+		);
+
+		$existing_notes = get_post_meta( $booking_id, '_bnb_booking_notes', true );
+		$new_notes      = $existing_notes ? $existing_notes . "\n\n" . $note : $note;
+		update_post_meta( $booking_id, '_bnb_booking_notes', $new_notes );
+
+		/**
+		 * Fires when booking status changes (triggers email notifications).
+		 *
+		 * @param int    $booking_id Booking ID.
+		 * @param string $old_status Old status.
+		 * @param string $new_status New status.
+		 */
+		do_action( 'wp_bnb_booking_status_changed', $booking_id, $old_status, 'cancelled' );
+	}
+
+	/**
+	 * Record partial refund without cancelling.
+	 *
+	 * @param int    $booking_id    Booking ID.
+	 * @param float  $refund_amount Refund amount.
+	 * @param string $reason        Refund reason.
+	 * @return void
+	 */
+	private static function record_partial_refund( int $booking_id, float $refund_amount, string $reason ): void {
+		// Get existing refund amount and add to it.
+		$existing_refund = floatval( get_post_meta( $booking_id, self::REFUND_AMOUNT_META, true ) );
+		$total_refund    = $existing_refund + $refund_amount;
+
+		// Update refund meta.
+		self::record_refund_meta( $booking_id, $total_refund, $reason );
+
+		// Add note about partial refund.
+		$note = sprintf(
+			/* translators: %s: Refund amount */
+			__( 'Partial refund processed: %s', 'wp-bnb' ),
+			wc_price( $refund_amount )
+		);
+
+		$existing_notes = get_post_meta( $booking_id, '_bnb_booking_notes', true );
+		$new_notes      = $existing_notes ? $existing_notes . "\n\n" . $note : $note;
+		update_post_meta( $booking_id, '_bnb_booking_notes', $new_notes );
+	}
+
+	/**
+	 * Record refund metadata.
+	 *
+	 * @param int    $booking_id    Booking ID.
+	 * @param float  $refund_amount Total refund amount.
+	 * @param string $reason        Refund reason.
+	 * @return void
+	 */
+	private static function record_refund_meta( int $booking_id, float $refund_amount, string $reason ): void {
+		update_post_meta( $booking_id, self::REFUND_AMOUNT_META, $refund_amount );
+		update_post_meta( $booking_id, self::REFUND_DATE_META, current_time( 'mysql' ) );
+
+		if ( $reason ) {
+			update_post_meta( $booking_id, self::REFUND_REASON_META, $reason );
+		}
+	}
+
+	/**
+	 * Calculate refund amount for a booking.
+	 *
+	 * @param int    $booking_id Booking ID.
+	 * @param string $type       Refund type: 'full' or 'nights_remaining'.
+	 * @return float Refund amount.
+	 */
+	public static function calculate_refund_amount( int $booking_id, string $type = 'full' ): float {
+		$calculated_price = floatval( get_post_meta( $booking_id, '_bnb_booking_calculated_price', true ) );
+
+		if ( 'full' === $type ) {
+			return $calculated_price;
+		}
+
+		// Calculate pro-rata based on nights remaining.
+		$check_in  = get_post_meta( $booking_id, '_bnb_booking_check_in', true );
+		$check_out = get_post_meta( $booking_id, '_bnb_booking_check_out', true );
+
+		if ( ! $check_in || ! $check_out ) {
+			return $calculated_price;
+		}
+
+		$today           = new \DateTime( 'today' );
+		$check_in_date   = \DateTime::createFromFormat( 'Y-m-d', $check_in );
+		$check_out_date  = \DateTime::createFromFormat( 'Y-m-d', $check_out );
+
+		if ( ! $check_in_date || ! $check_out_date ) {
+			return $calculated_price;
+		}
+
+		// If check-in hasn't happened, full refund.
+		if ( $today < $check_in_date ) {
+			return $calculated_price;
+		}
+
+		// If check-out has passed, no refund.
+		if ( $today >= $check_out_date ) {
+			return 0.0;
+		}
+
+		// Calculate remaining nights.
+		$total_nights     = $check_in_date->diff( $check_out_date )->days;
+		$nights_used      = $check_in_date->diff( $today )->days;
+		$nights_remaining = $total_nights - $nights_used;
+
+		if ( $total_nights <= 0 ) {
+			return 0.0;
+		}
+
+		// Pro-rata refund.
+		$nightly_rate = $calculated_price / $total_nights;
+
+		return $nightly_rate * $nights_remaining;
+	}
+
+	/**
+	 * Get refund info for a booking.
+	 *
+	 * @param int $booking_id Booking ID.
+	 * @return array|null Refund info or null.
+	 */
+	public static function get_booking_refund_info( int $booking_id ): ?array {
+		$amount = get_post_meta( $booking_id, self::REFUND_AMOUNT_META, true );
+
+		if ( ! $amount ) {
+			return null;
+		}
+
+		return array(
+			'amount' => floatval( $amount ),
+			'reason' => get_post_meta( $booking_id, self::REFUND_REASON_META, true ),
+			'date'   => get_post_meta( $booking_id, self::REFUND_DATE_META, true ),
+		);
+	}
+
+	/**
+	 * Add booking refund notice in admin order page.
+	 *
+	 * @param int $order_id Order ID.
+	 * @return void
+	 */
+	public static function add_booking_refund_notice( int $order_id ): void {
+		$order = wc_get_order( $order_id );
+
+		if ( ! $order instanceof \WC_Order ) {
+			return;
+		}
+
+		$booking_id = Manager::get_booking_for_order( $order );
+
+		if ( ! $booking_id ) {
+			return;
+		}
+
+		$refund_info = self::get_booking_refund_info( $booking_id );
+
+		if ( ! $refund_info ) {
+			return;
+		}
+
+		$booking_status = get_post_meta( $booking_id, '_bnb_booking_status', true );
+		?>
+		<tr>
+			<td class="label"><?php esc_html_e( 'Booking Status', 'wp-bnb' ); ?>:</td>
+			<td width="1%"></td>
+			<td class="total">
+				<span class="bnb-status-badge bnb-status-<?php echo esc_attr( $booking_status ); ?>">
+					<?php echo esc_html( ucfirst( str_replace( '_', ' ', $booking_status ) ) ); ?>
+				</span>
+			</td>
+		</tr>
+		<?php if ( 'cancelled' === $booking_status ) : ?>
+		<tr>
+			<td class="label" colspan="2">
+				<small class="description">
+					<?php
+					printf(
+						/* translators: %s: Booking edit link */
+						esc_html__( 'Booking was cancelled due to refund. %s', 'wp-bnb' ),
+						'<a href="' . esc_url( get_edit_post_link( $booking_id ) ) . '">' . esc_html__( 'View booking', 'wp-bnb' ) . '</a>'
+					);
+					?>
+				</small>
+			</td>
+		</tr>
+		<?php endif; ?>
+		<?php
+	}
+}

src/Plugin.php

@@ -21,6 +21,7 @@ use Magdev\WpBnb\Frontend\Shortcodes;
 use Magdev\WpBnb\Api\RestApi;
 use Magdev\WpBnb\Integration\CF7;
 use Magdev\WpBnb\Integration\Prometheus;
+use Magdev\WpBnb\Integration\WooCommerce\Manager as WooCommerceManager;
 use Magdev\WpBnb\Frontend\Widgets\AvailabilityCalendar;
 use Magdev\WpBnb\Frontend\Widgets\BuildingRooms;
 use Magdev\WpBnb\Frontend\Widgets\SimilarRooms;
@@ -147,6 +148,11 @@ final class Plugin {
 		// Initialize Prometheus metrics integration.
 		Prometheus::init();
 
+		// Initialize WooCommerce integration if WooCommerce is active.
+		if ( class_exists( 'WooCommerce' ) ) {
+			WooCommerceManager::init();
+		}
+
 		// Initialize REST API.
 		$this->init_rest_api();
 
@@ -636,6 +642,10 @@ final class Plugin {
 				   class="nav-tab <?php echo 'api' === $active_tab ? 'nav-tab-active' : ''; ?>">
 					<?php esc_html_e( 'API', 'wp-bnb' ); ?>
 				</a>
+				<a href="<?php echo esc_url( admin_url( 'admin.php?page=wp-bnb-settings&tab=woocommerce' ) ); ?>"
+				   class="nav-tab <?php echo 'woocommerce' === $active_tab ? 'nav-tab-active' : ''; ?>">
+					<?php esc_html_e( 'WooCommerce', 'wp-bnb' ); ?>
+				</a>
 			</nav>
 
 			<div class="tab-content">
@@ -656,6 +666,9 @@ final class Plugin {
 					case 'api':
 						$this->render_api_settings();
 						break;
+					case 'woocommerce':
+						$this->render_woocommerce_settings();
+						break;
 					default:
 						$this->render_general_settings();
 						break;
@@ -1854,6 +1867,9 @@ final class Plugin {
 			case 'api':
 				$this->save_api_settings();
 				break;
+			case 'woocommerce':
+				$this->save_woocommerce_settings();
+				break;
 			default:
 				$this->save_general_settings();
 				break;
@@ -2037,6 +2053,379 @@ final class Plugin {
 		settings_errors( 'wp_bnb_settings' );
 	}
 
+	/**
+	 * Render WooCommerce settings tab.
+	 *
+	 * @return void
+	 */
+	private function render_woocommerce_settings(): void {
+		// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- Subtab switching only.
+		$active_subtab = isset( $_GET['subtab'] ) ? sanitize_key( $_GET['subtab'] ) : 'general';
+		$base_url      = admin_url( 'admin.php?page=wp-bnb-settings&tab=woocommerce' );
+
+		$wc_active = class_exists( 'WooCommerce' );
+		?>
+		<div class="wp-bnb-subtabs">
+			<a href="<?php echo esc_url( $base_url . '&subtab=general' ); ?>"
+			   class="wp-bnb-subtab <?php echo 'general' === $active_subtab ? 'active' : ''; ?>">
+				<span class="dashicons dashicons-admin-generic"></span>
+				<?php esc_html_e( 'General', 'wp-bnb' ); ?>
+			</a>
+			<a href="<?php echo esc_url( $base_url . '&subtab=products' ); ?>"
+			   class="wp-bnb-subtab <?php echo 'products' === $active_subtab ? 'active' : ''; ?>">
+				<span class="dashicons dashicons-products"></span>
+				<?php esc_html_e( 'Products', 'wp-bnb' ); ?>
+			</a>
+			<a href="<?php echo esc_url( $base_url . '&subtab=orders' ); ?>"
+			   class="wp-bnb-subtab <?php echo 'orders' === $active_subtab ? 'active' : ''; ?>">
+				<span class="dashicons dashicons-cart"></span>
+				<?php esc_html_e( 'Orders', 'wp-bnb' ); ?>
+			</a>
+			<a href="<?php echo esc_url( $base_url . '&subtab=invoices' ); ?>"
+			   class="wp-bnb-subtab <?php echo 'invoices' === $active_subtab ? 'active' : ''; ?>">
+				<span class="dashicons dashicons-media-document"></span>
+				<?php esc_html_e( 'Invoices', 'wp-bnb' ); ?>
+			</a>
+		</div>
+
+		<?php if ( ! $wc_active ) : ?>
+			<div class="notice notice-warning inline">
+				<p>
+					<strong><?php esc_html_e( 'WooCommerce is not active.', 'wp-bnb' ); ?></strong>
+					<?php esc_html_e( 'Please install and activate WooCommerce to use these features.', 'wp-bnb' ); ?>
+				</p>
+			</div>
+		<?php endif; ?>
+
+		<?php
+		switch ( $active_subtab ) {
+			case 'products':
+				$this->render_wc_products_subtab( $wc_active );
+				break;
+			case 'orders':
+				$this->render_wc_orders_subtab( $wc_active );
+				break;
+			case 'invoices':
+				$this->render_wc_invoices_subtab( $wc_active );
+				break;
+			default:
+				$this->render_wc_general_subtab( $wc_active );
+				break;
+		}
+	}
+
+	/**
+	 * Render WooCommerce General subtab.
+	 *
+	 * @param bool $wc_active Whether WooCommerce is active.
+	 * @return void
+	 */
+	private function render_wc_general_subtab( bool $wc_active ): void {
+		?>
+		<form method="post" action="">
+			<?php wp_nonce_field( 'wp_bnb_save_settings', 'wp_bnb_settings_nonce' ); ?>
+			<input type="hidden" name="wc_subtab" value="general">
+
+			<h2><?php esc_html_e( 'WooCommerce Integration', 'wp-bnb' ); ?></h2>
+
+			<table class="form-table" role="presentation">
+				<tr>
+					<th scope="row"><?php esc_html_e( 'Enable Integration', 'wp-bnb' ); ?></th>
+					<td>
+						<label for="wp_bnb_wc_enabled">
+							<input type="checkbox" name="wp_bnb_wc_enabled" id="wp_bnb_wc_enabled" value="yes"
+								   <?php checked( 'yes', get_option( WooCommerceManager::OPTION_ENABLED, 'no' ) ); ?>
+								   <?php disabled( ! $wc_active ); ?>>
+							<?php esc_html_e( 'Enable WooCommerce integration for bookings', 'wp-bnb' ); ?>
+						</label>
+						<p class="description">
+							<?php esc_html_e( 'Allow guests to book and pay through WooCommerce checkout.', 'wp-bnb' ); ?>
+						</p>
+					</td>
+				</tr>
+				<tr>
+					<th scope="row"><?php esc_html_e( 'Auto-Confirm Bookings', 'wp-bnb' ); ?></th>
+					<td>
+						<label for="wp_bnb_wc_auto_confirm_booking">
+							<input type="checkbox" name="wp_bnb_wc_auto_confirm_booking" id="wp_bnb_wc_auto_confirm_booking" value="yes"
+								   <?php checked( 'yes', get_option( WooCommerceManager::OPTION_AUTO_CONFIRM, 'yes' ) ); ?>
+								   <?php disabled( ! $wc_active ); ?>>
+							<?php esc_html_e( 'Automatically confirm booking when payment is completed', 'wp-bnb' ); ?>
+						</label>
+						<p class="description">
+							<?php esc_html_e( 'If disabled, bookings will remain pending until manually confirmed.', 'wp-bnb' ); ?>
+						</p>
+					</td>
+				</tr>
+			</table>
+
+			<?php if ( $wc_active ) : ?>
+				<p class="submit">
+					<input type="submit" name="submit" class="button button-primary"
+						   value="<?php esc_attr_e( 'Save Settings', 'wp-bnb' ); ?>">
+				</p>
+			<?php endif; ?>
+		</form>
+		<?php
+	}
+
+	/**
+	 * Render WooCommerce Products subtab.
+	 *
+	 * @param bool $wc_active Whether WooCommerce is active.
+	 * @return void
+	 */
+	private function render_wc_products_subtab( bool $wc_active ): void {
+		$categories = array();
+		if ( $wc_active ) {
+			$categories = get_terms(
+				array(
+					'taxonomy'   => 'product_cat',
+					'hide_empty' => false,
+				)
+			);
+		}
+		?>
+		<form method="post" action="">
+			<?php wp_nonce_field( 'wp_bnb_save_settings', 'wp_bnb_settings_nonce' ); ?>
+			<input type="hidden" name="wc_subtab" value="products">
+
+			<h2><?php esc_html_e( 'Product Synchronization', 'wp-bnb' ); ?></h2>
+
+			<table class="form-table" role="presentation">
+				<tr>
+					<th scope="row"><?php esc_html_e( 'Auto-Sync Products', 'wp-bnb' ); ?></th>
+					<td>
+						<label for="wp_bnb_wc_auto_sync_products">
+							<input type="checkbox" name="wp_bnb_wc_auto_sync_products" id="wp_bnb_wc_auto_sync_products" value="yes"
+								   <?php checked( 'yes', get_option( WooCommerceManager::OPTION_AUTO_SYNC, 'yes' ) ); ?>
+								   <?php disabled( ! $wc_active ); ?>>
+							<?php esc_html_e( 'Automatically create/update WooCommerce products when rooms are saved', 'wp-bnb' ); ?>
+						</label>
+					</td>
+				</tr>
+				<tr>
+					<th scope="row">
+						<label for="wp_bnb_wc_product_category"><?php esc_html_e( 'Product Category', 'wp-bnb' ); ?></label>
+					</th>
+					<td>
+						<select name="wp_bnb_wc_product_category" id="wp_bnb_wc_product_category" <?php disabled( ! $wc_active ); ?>>
+							<option value=""><?php esc_html_e( '— No category —', 'wp-bnb' ); ?></option>
+							<?php foreach ( $categories as $cat ) : ?>
+								<option value="<?php echo esc_attr( $cat->term_id ); ?>"
+									<?php selected( get_option( WooCommerceManager::OPTION_PRODUCT_CATEGORY, 0 ), $cat->term_id ); ?>>
+									<?php echo esc_html( $cat->name ); ?>
+								</option>
+							<?php endforeach; ?>
+						</select>
+						<p class="description">
+							<?php esc_html_e( 'Assign synced room products to this WooCommerce category.', 'wp-bnb' ); ?>
+						</p>
+					</td>
+				</tr>
+			</table>
+
+			<?php if ( $wc_active ) : ?>
+				<h3><?php esc_html_e( 'Manual Sync', 'wp-bnb' ); ?></h3>
+				<p>
+					<button type="button" class="button bnb-sync-rooms-btn">
+						<span class="dashicons dashicons-update"></span>
+						<?php esc_html_e( 'Sync All Rooms Now', 'wp-bnb' ); ?>
+					</button>
+					<span class="sync-status"></span>
+				</p>
+				<p class="description">
+					<?php esc_html_e( 'Creates or updates WooCommerce products for all published rooms.', 'wp-bnb' ); ?>
+				</p>
+
+				<p class="submit">
+					<input type="submit" name="submit" class="button button-primary"
+						   value="<?php esc_attr_e( 'Save Settings', 'wp-bnb' ); ?>">
+				</p>
+			<?php endif; ?>
+		</form>
+		<?php
+	}
+
+	/**
+	 * Render WooCommerce Orders subtab.
+	 *
+	 * @param bool $wc_active Whether WooCommerce is active.
+	 * @return void
+	 */
+	private function render_wc_orders_subtab( bool $wc_active ): void {
+		?>
+		<h2><?php esc_html_e( 'Order-Booking Status Mapping', 'wp-bnb' ); ?></h2>
+
+		<p class="description">
+			<?php esc_html_e( 'The following table shows how WooCommerce order statuses map to booking statuses.', 'wp-bnb' ); ?>
+		</p>
+
+		<table class="widefat fixed striped" style="max-width: 600px; margin-top: 15px;">
+			<thead>
+				<tr>
+					<th><?php esc_html_e( 'WooCommerce Status', 'wp-bnb' ); ?></th>
+					<th><?php esc_html_e( 'Booking Status', 'wp-bnb' ); ?></th>
+				</tr>
+			</thead>
+			<tbody>
+				<tr>
+					<td><?php esc_html_e( 'Pending Payment', 'wp-bnb' ); ?></td>
+					<td><span class="bnb-status-badge bnb-status-pending"><?php esc_html_e( 'Pending', 'wp-bnb' ); ?></span></td>
+				</tr>
+				<tr>
+					<td><?php esc_html_e( 'On Hold', 'wp-bnb' ); ?></td>
+					<td><span class="bnb-status-badge bnb-status-pending"><?php esc_html_e( 'Pending', 'wp-bnb' ); ?></span></td>
+				</tr>
+				<tr>
+					<td><?php esc_html_e( 'Processing', 'wp-bnb' ); ?></td>
+					<td>
+						<?php if ( get_option( WooCommerceManager::OPTION_AUTO_CONFIRM, 'yes' ) === 'yes' ) : ?>
+							<span class="bnb-status-badge bnb-status-confirmed"><?php esc_html_e( 'Confirmed', 'wp-bnb' ); ?></span>
+						<?php else : ?>
+							<span class="bnb-status-badge bnb-status-pending"><?php esc_html_e( 'Pending', 'wp-bnb' ); ?></span>
+						<?php endif; ?>
+					</td>
+				</tr>
+				<tr>
+					<td><?php esc_html_e( 'Completed', 'wp-bnb' ); ?></td>
+					<td><span class="bnb-status-badge bnb-status-confirmed"><?php esc_html_e( 'Confirmed', 'wp-bnb' ); ?></span></td>
+				</tr>
+				<tr>
+					<td><?php esc_html_e( 'Cancelled / Refunded / Failed', 'wp-bnb' ); ?></td>
+					<td><span class="bnb-status-badge bnb-status-cancelled"><?php esc_html_e( 'Cancelled', 'wp-bnb' ); ?></span></td>
+				</tr>
+			</tbody>
+		</table>
+
+		<h3><?php esc_html_e( 'Refund Handling', 'wp-bnb' ); ?></h3>
+		<ul style="list-style: disc; margin-left: 20px;">
+			<li><?php esc_html_e( 'Full refunds automatically cancel the linked booking.', 'wp-bnb' ); ?></li>
+			<li><?php esc_html_e( 'Partial refunds are recorded but do not cancel the booking.', 'wp-bnb' ); ?></li>
+			<li><?php esc_html_e( 'Cancellation emails are sent when a booking is cancelled due to refund.', 'wp-bnb' ); ?></li>
+		</ul>
+		<?php
+	}
+
+	/**
+	 * Render WooCommerce Invoices subtab.
+	 *
+	 * @param bool $wc_active Whether WooCommerce is active.
+	 * @return void
+	 */
+	private function render_wc_invoices_subtab( bool $wc_active ): void {
+		?>
+		<form method="post" action="">
+			<?php wp_nonce_field( 'wp_bnb_save_settings', 'wp_bnb_settings_nonce' ); ?>
+			<input type="hidden" name="wc_subtab" value="invoices">
+
+			<h2><?php esc_html_e( 'Invoice Settings', 'wp-bnb' ); ?></h2>
+
+			<table class="form-table" role="presentation">
+				<tr>
+					<th scope="row"><?php esc_html_e( 'Attach to Emails', 'wp-bnb' ); ?></th>
+					<td>
+						<label for="wp_bnb_wc_invoice_attach">
+							<input type="checkbox" name="wp_bnb_wc_invoice_attach" id="wp_bnb_wc_invoice_attach" value="yes"
+								   <?php checked( 'yes', get_option( WooCommerceManager::OPTION_INVOICE_ATTACH, 'yes' ) ); ?>
+								   <?php disabled( ! $wc_active ); ?>>
+							<?php esc_html_e( 'Attach PDF invoice to order confirmation emails', 'wp-bnb' ); ?>
+						</label>
+					</td>
+				</tr>
+				<tr>
+					<th scope="row">
+						<label for="wp_bnb_invoice_prefix"><?php esc_html_e( 'Invoice Number Prefix', 'wp-bnb' ); ?></label>
+					</th>
+					<td>
+						<input type="text" name="wp_bnb_invoice_prefix" id="wp_bnb_invoice_prefix"
+							   value="<?php echo esc_attr( get_option( WooCommerceManager::OPTION_INVOICE_PREFIX, 'INV-' ) ); ?>"
+							   class="regular-text" <?php disabled( ! $wc_active ); ?>>
+						<p class="description">
+							<?php esc_html_e( 'Prefix for invoice numbers (e.g., INV- for INV-00001).', 'wp-bnb' ); ?>
+						</p>
+					</td>
+				</tr>
+				<tr>
+					<th scope="row">
+						<label for="wp_bnb_invoice_start_number"><?php esc_html_e( 'Starting Number', 'wp-bnb' ); ?></label>
+					</th>
+					<td>
+						<input type="number" name="wp_bnb_invoice_start_number" id="wp_bnb_invoice_start_number"
+							   value="<?php echo esc_attr( get_option( WooCommerceManager::OPTION_INVOICE_START_NUMBER, 1000 ) ); ?>"
+							   class="small-text" min="1" <?php disabled( ! $wc_active ); ?>>
+						<p class="description">
+							<?php esc_html_e( 'Starting number for new invoices (only applies if no invoices generated yet).', 'wp-bnb' ); ?>
+						</p>
+					</td>
+				</tr>
+				<tr>
+					<th scope="row">
+						<label for="wp_bnb_invoice_footer"><?php esc_html_e( 'Footer Text', 'wp-bnb' ); ?></label>
+					</th>
+					<td>
+						<textarea name="wp_bnb_invoice_footer" id="wp_bnb_invoice_footer" rows="3" class="large-text"
+								  <?php disabled( ! $wc_active ); ?>><?php echo esc_textarea( get_option( WooCommerceManager::OPTION_INVOICE_FOOTER, '' ) ); ?></textarea>
+						<p class="description">
+							<?php esc_html_e( 'Custom footer text for invoices (e.g., terms and conditions).', 'wp-bnb' ); ?>
+						</p>
+					</td>
+				</tr>
+			</table>
+
+			<?php if ( $wc_active ) : ?>
+				<p class="submit">
+					<input type="submit" name="submit" class="button button-primary"
+						   value="<?php esc_attr_e( 'Save Settings', 'wp-bnb' ); ?>">
+				</p>
+			<?php endif; ?>
+		</form>
+		<?php
+	}
+
+	/**
+	 * Save WooCommerce settings.
+	 *
+	 * @return void
+	 */
+	private function save_woocommerce_settings(): void {
+		// phpcs:ignore WordPress.Security.NonceVerification.Missing -- Nonce verified in render_settings_page.
+		$subtab = isset( $_POST['wc_subtab'] ) ? sanitize_key( $_POST['wc_subtab'] ) : 'general';
+
+		switch ( $subtab ) {
+			case 'products':
+				$auto_sync = isset( $_POST['wp_bnb_wc_auto_sync_products'] ) ? 'yes' : 'no';
+				$category  = isset( $_POST['wp_bnb_wc_product_category'] ) ? absint( $_POST['wp_bnb_wc_product_category'] ) : 0;
+
+				update_option( WooCommerceManager::OPTION_AUTO_SYNC, $auto_sync );
+				update_option( WooCommerceManager::OPTION_PRODUCT_CATEGORY, $category );
+				break;
+
+			case 'invoices':
+				$attach       = isset( $_POST['wp_bnb_wc_invoice_attach'] ) ? 'yes' : 'no';
+				$prefix       = isset( $_POST['wp_bnb_invoice_prefix'] ) ? sanitize_text_field( wp_unslash( $_POST['wp_bnb_invoice_prefix'] ) ) : 'INV-';
+				$start_number = isset( $_POST['wp_bnb_invoice_start_number'] ) ? absint( $_POST['wp_bnb_invoice_start_number'] ) : 1000;
+				$footer       = isset( $_POST['wp_bnb_invoice_footer'] ) ? sanitize_textarea_field( wp_unslash( $_POST['wp_bnb_invoice_footer'] ) ) : '';
+
+				update_option( WooCommerceManager::OPTION_INVOICE_ATTACH, $attach );
+				update_option( WooCommerceManager::OPTION_INVOICE_PREFIX, $prefix );
+				update_option( WooCommerceManager::OPTION_INVOICE_START_NUMBER, $start_number );
+				update_option( WooCommerceManager::OPTION_INVOICE_FOOTER, $footer );
+				break;
+
+			default: // general
+				$enabled      = isset( $_POST['wp_bnb_wc_enabled'] ) ? 'yes' : 'no';
+				$auto_confirm = isset( $_POST['wp_bnb_wc_auto_confirm_booking'] ) ? 'yes' : 'no';
+
+				update_option( WooCommerceManager::OPTION_ENABLED, $enabled );
+				update_option( WooCommerceManager::OPTION_AUTO_CONFIRM, $auto_confirm );
+				break;
+		}
+
+		add_settings_error( 'wp_bnb_settings', 'settings_saved', __( 'WooCommerce settings saved.', 'wp-bnb' ), 'success' );
+		settings_errors( 'wp_bnb_settings' );
+	}
+
 	/**
 	 * AJAX handler for checking room availability.
 	 *

wp-bnb.php

@@ -3,7 +3,7 @@
  * Plugin Name: WP BnB Management
  * Plugin URI: https://src.bundespruefstelle.ch/magdev/wp-bnb
  * Description: A comprehensive Bed & Breakfast management system for WordPress. Manage buildings, rooms, bookings, and guests.
- * Version: 0.10.1
+ * Version: 0.11.0
  * Requires at least: 6.0
  * Requires PHP: 8.3
  * Author: Marco Graetsch
@@ -24,7 +24,7 @@ if ( ! defined( 'ABSPATH' ) ) {
 }
 
 // Plugin version constant - MUST match Version in header above.
-define( 'WP_BNB_VERSION', '0.10.1' );
+define( 'WP_BNB_VERSION', '0.11.0' );
 
 // Plugin path constants.
 define( 'WP_BNB_PATH', plugin_dir_path( __FILE__ ) );