Implement version 0.0.8 features

- Remove Current Version field from product license settings
- Derive current version from latest product version in database
- Refactor email system to use WooCommerce email notification classes
- Add LicenseExpirationEmail WC_Email class for expiration warnings
- Add customizable email templates (HTML and plain text)
- Update settings to link to WooCommerce email configuration
- Update translations for new email-related strings

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

CLAUDE.md

@@ -36,10 +36,6 @@ This project is proudly **"vibe-coded"** using Claude.AI - the entire codebase w
 
 _No known bugs at this time._
 
-### Version 0.0.8 (Next)
-
-_No planned features yet. Add items as needed._
-
 ## Technical Stack
 
 - **Language:** PHP 8.3.x
@@ -429,3 +425,38 @@ Full API documentation available in `openapi.json` (OpenAPI 3.1 specification).
 - Expiration warnings use WordPress cron with daily schedule
 - CSV import supports both exported format and simplified format
 - User meta tracks expiration notifications to prevent duplicates
+
+### 2026-01-21 - Version 0.0.8 Features
+
+**Implemented:**
+
+- Removed "Current Version" field from product license settings
+- Current version now automatically derived from latest product version in database
+- Refactored email system to use WooCommerce email notification classes
+- License Expiration Warning email is now configurable via WooCommerce > Settings > Emails
+- Email templates can be overridden in themes (woocommerce/emails/license-expiration.php)
+- Configurable warning days for expiration notifications (first and second warning)
+
+**New classes:**
+
+- `LicenseExpirationEmail` - WooCommerce WC_Email subclass for license expiration warnings
+
+**New files:**
+
+- `templates/emails/license-expiration.php` - HTML email template
+- `templates/emails/plain/license-expiration.php` - Plain text email template
+
+**Modified classes:**
+
+- `LicensedProduct` - `get_current_version()` and `get_major_version()` now query VersionManager
+- `LicensedProductType` - Removed Current Version field from product data panel
+- `VersionAdminController` - Removed automatic update of `_licensed_current_version` meta
+- `LicenseEmailController` - Registers WooCommerce email class, uses WC email system for sending
+- `SettingsController` - Updated email section to link to WooCommerce email settings
+
+**Technical notes:**
+
+- WooCommerce email system allows admins to customize subject, heading, content, and enable/disable
+- Email templates follow WooCommerce conventions and can be overridden in themes
+- Expiration warning schedule (days before) remains in plugin settings
+- Email enable/disable is controlled through WooCommerce email settings

languages/wc-licensed-product-de_CH.po

@@ -3,7 +3,7 @@
 # This file is distributed under the GPL-2.0-or-later.
 msgid ""
 msgstr ""
-"Project-Id-Version: WC Licensed Product 0.0.7\n"
+"Project-Id-Version: WC Licensed Product 0.0.8\n"
 "Report-Msgid-Bugs-To: https://src.bundespruefstelle.ch/magdev/wc-licensed-product/issues\n"
 "POT-Creation-Date: 2026-01-21T00:00:00+00:00\n"
 "PO-Revision-Date: 2026-01-21T00:00:00+00:00\n"
@@ -63,12 +63,6 @@ msgstr "Falls aktiviert, werden Lizenzen an die Hauptversion zum Kaufzeitpunkt g
 msgid "If enabled, licenses are bound to the major version at purchase time by default."
 msgstr "Falls aktiviert, werden Lizenzen standardmässig an die Hauptversion zum Kaufzeitpunkt gebunden."
 
-msgid "Current Version"
-msgstr "Aktuelle Version"
-
-msgid "Current software version (e.g., 1.0.0)"
-msgstr "Aktuelle Software-Version (z.B. 1.0.0)"
-
 #. Global settings
 msgid "Default License Settings"
 msgstr "Standard Lizenz-Einstellungen"
@@ -818,3 +812,56 @@ msgstr "Ja"
 
 msgid "No"
 msgstr "Nein"
+
+#. Email settings
+msgid "Expiration Warning Schedule"
+msgstr "Ablaufwarnung Zeitplan"
+
+msgid "Configure when expiration warning emails are sent. To customize the email template, enable/disable, or change the subject, go to %s."
+msgstr "Konfigurieren Sie, wann Ablaufwarnungs-E-Mails gesendet werden. Um die E-Mail-Vorlage anzupassen, zu aktivieren/deaktivieren oder den Betreff zu ändern, gehen Sie zu %s."
+
+msgid "WooCommerce > Settings > Emails > License Expiration Warning"
+msgstr "WooCommerce > Einstellungen > E-Mails > Lizenzablauf-Warnung"
+
+msgid "First Warning (Days Before)"
+msgstr "Erste Warnung (Tage vorher)"
+
+msgid "Days before expiration to send the first warning email."
+msgstr "Tage vor Ablauf, um die erste Warn-E-Mail zu senden."
+
+msgid "Second Warning (Days Before)"
+msgstr "Zweite Warnung (Tage vorher)"
+
+msgid "Days before expiration to send the second warning email. Set to 0 to disable."
+msgstr "Tage vor Ablauf, um die zweite Warn-E-Mail zu senden. Setzen Sie auf 0, um sie zu deaktivieren."
+
+#. WooCommerce Email Class
+msgid "License Expiration Warning"
+msgstr "Lizenzablauf-Warnung"
+
+msgid "License expiration warning emails are sent to customers when their licenses are about to expire."
+msgstr "Lizenzablauf-Warnungs-E-Mails werden an Kunden gesendet, wenn ihre Lizenzen bald ablaufen."
+
+msgid "[{site_title}] Your license for {product_name} expires in {days_remaining} days"
+msgstr "[{site_title}] Ihre Lizenz für {product_name} läuft in {days_remaining} Tagen ab"
+
+msgid "Available placeholders: %s"
+msgstr "Verfügbare Platzhalter: %s"
+
+msgid "Enable this email notification"
+msgstr "Diese E-Mail-Benachrichtigung aktivieren"
+
+msgid "Email heading"
+msgstr "E-Mail-Überschrift"
+
+msgid "Additional content"
+msgstr "Zusätzlicher Inhalt"
+
+msgid "Text to appear below the main email content."
+msgstr "Text, der unter dem Haupt-E-Mail-Inhalt erscheinen soll."
+
+msgid "Email type"
+msgstr "E-Mail-Typ"
+
+msgid "Choose which format of email to send."
+msgstr "Wählen Sie, welches E-Mail-Format gesendet werden soll."

languages/wc-licensed-product.pot

@@ -2,7 +2,7 @@
 # This file is distributed under the GPL-2.0-or-later.
 msgid ""
 msgstr ""
-"Project-Id-Version: WC Licensed Product 0.0.7\n"
+"Project-Id-Version: WC Licensed Product 0.0.8\n"
 "Report-Msgid-Bugs-To: https://src.bundespruefstelle.ch/magdev/wc-licensed-product/issues\n"
 "POT-Creation-Date: 2026-01-21T00:00:00+00:00\n"
 "MIME-Version: 1.0\n"
@@ -60,12 +60,6 @@ msgstr ""
 msgid "If enabled, licenses are bound to the major version at purchase time by default."
 msgstr ""
 
-msgid "Current Version"
-msgstr ""
-
-msgid "Current software version (e.g., 1.0.0)"
-msgstr ""
-
 #. Global settings
 msgid "Default License Settings"
 msgstr ""
@@ -815,3 +809,59 @@ msgstr ""
 
 msgid "No"
 msgstr ""
+
+#. Email settings
+msgid "Expiration Warning Schedule"
+msgstr ""
+
+msgid "Configure when expiration warning emails are sent. To customize the email template, enable/disable, or change the subject, go to %s."
+msgstr ""
+
+msgid "WooCommerce > Settings > Emails > License Expiration Warning"
+msgstr ""
+
+msgid "First Warning (Days Before)"
+msgstr ""
+
+msgid "Days before expiration to send the first warning email."
+msgstr ""
+
+msgid "Second Warning (Days Before)"
+msgstr ""
+
+msgid "Days before expiration to send the second warning email. Set to 0 to disable."
+msgstr ""
+
+#. WooCommerce Email Class
+msgid "License Expiration Warning"
+msgstr ""
+
+msgid "License expiration warning emails are sent to customers when their licenses are about to expire."
+msgstr ""
+
+msgid "[{site_title}] Your license for {product_name} expires in {days_remaining} days"
+msgstr ""
+
+msgid "Available placeholders: %s"
+msgstr ""
+
+msgid "Enable this email notification"
+msgstr ""
+
+msgid "Email heading"
+msgstr ""
+
+msgid "Additional content"
+msgstr ""
+
+msgid "Text to appear below the main email content."
+msgstr ""
+
+msgid "Email type"
+msgstr ""
+
+msgid "Choose which format of email to send."
+msgstr ""
+
+msgid "Customer"
+msgstr ""

src/Admin/SettingsController.php

@@ -92,6 +92,44 @@ final class SettingsController
                 'type' => 'sectionend',
                 'id' => 'wc_licensed_product_section_defaults_end',
             ],
+            // Email settings section
+            'email_section_title' => [
+                'name' => __('Expiration Warning Schedule', 'wc-licensed-product'),
+                'type' => 'title',
+                'desc' => sprintf(
+                    /* translators: %s: URL to WooCommerce email settings */
+                    __('Configure when expiration warning emails are sent. To customize the email template, enable/disable, or change the subject, go to %s.', 'wc-licensed-product'),
+                    '<a href="' . esc_url(admin_url('admin.php?page=wc-settings&tab=email&section=wclp_license_expiration')) . '">' .
+                    __('WooCommerce > Settings > Emails > License Expiration Warning', 'wc-licensed-product') . '</a>'
+                ),
+                'id' => 'wc_licensed_product_section_email',
+            ],
+            'expiration_warning_days_first' => [
+                'name' => __('First Warning (Days Before)', 'wc-licensed-product'),
+                'type' => 'number',
+                'desc' => __('Days before expiration to send the first warning email.', 'wc-licensed-product'),
+                'id' => 'wc_licensed_product_expiration_warning_days_first',
+                'default' => '7',
+                'custom_attributes' => [
+                    'min' => '1',
+                    'step' => '1',
+                ],
+            ],
+            'expiration_warning_days_second' => [
+                'name' => __('Second Warning (Days Before)', 'wc-licensed-product'),
+                'type' => 'number',
+                'desc' => __('Days before expiration to send the second warning email. Set to 0 to disable.', 'wc-licensed-product'),
+                'id' => 'wc_licensed_product_expiration_warning_days_second',
+                'default' => '1',
+                'custom_attributes' => [
+                    'min' => '0',
+                    'step' => '1',
+                ],
+            ],
+            'email_section_end' => [
+                'type' => 'sectionend',
+                'id' => 'wc_licensed_product_section_email_end',
+            ],
         ];
     }
 
@@ -139,4 +177,37 @@ final class SettingsController
     {
         return get_option('wc_licensed_product_default_bind_to_version', 'no') === 'yes';
     }
+
+    /**
+     * Check if expiration warning emails are enabled
+     * This checks both the WooCommerce email setting and the old setting for backwards compatibility
+     */
+    public static function isExpirationEmailsEnabled(): bool
+    {
+        // Check WooCommerce email enabled status
+        $emailEnabled = get_option('woocommerce_wclp_license_expiration_settings');
+        if (is_array($emailEnabled) && isset($emailEnabled['enabled'])) {
+            return $emailEnabled['enabled'] === 'yes';
+        }
+        // Default to enabled if not yet configured
+        return true;
+    }
+
+    /**
+     * Get first warning days before expiration
+     */
+    public static function getFirstWarningDays(): int
+    {
+        $value = get_option('wc_licensed_product_expiration_warning_days_first', 7);
+        return max(1, (int) $value);
+    }
+
+    /**
+     * Get second warning days before expiration
+     */
+    public static function getSecondWarningDays(): int
+    {
+        $value = get_option('wc_licensed_product_expiration_warning_days_second', 1);
+        return max(0, (int) $value);
+    }
 }

src/Admin/VersionAdminController.php

@@ -263,9 +263,6 @@ final class VersionAdminController
             wp_send_json_error(['message' => __('Failed to create version.', 'wc-licensed-product')]);
         }
 
-        // Also update the product's current version meta
-        update_post_meta($productId, '_licensed_current_version', $version);
-
         wp_send_json_success([
             'message' => __('Version added successfully.', 'wc-licensed-product'),
             'version' => $newVersion->toArray(),

src/Email/LicenseEmailController.php

@@ -10,6 +10,7 @@ declare(strict_types=1);
 namespace Jeremias\WcLicensedProduct\Email;
 
 use Jeremias\WcLicensedProduct\License\LicenseManager;
+use Jeremias\WcLicensedProduct\Admin\SettingsController;
 
 /**
  * Handles email notifications for licenses
@@ -29,6 +30,9 @@ final class LicenseEmailController
      */
     private function registerHooks(): void
     {
+        // Register custom WooCommerce email classes
+        add_filter('woocommerce_email_classes', [$this, 'registerEmailClasses']);
+
         // Add license info to order completed email
         add_action('woocommerce_email_after_order_table', [$this, 'addLicenseInfoToEmail'], 20, 4);
 
@@ -40,6 +44,45 @@ final class LicenseEmailController
 
         // Cron action for checking expiring licenses
         add_action('wclp_check_expiring_licenses', [$this, 'sendExpirationWarnings']);
+
+        // Add email templates location for theme overrides
+        add_filter('woocommerce_locate_template', [$this, 'locateTemplate'], 10, 3);
+    }
+
+    /**
+     * Register custom email classes with WooCommerce
+     *
+     * @param array $email_classes Existing email classes
+     * @return array Modified email classes
+     */
+    public function registerEmailClasses(array $email_classes): array
+    {
+        $email_classes['WCLP_License_Expiration'] = new LicenseExpirationEmail();
+        return $email_classes;
+    }
+
+    /**
+     * Locate templates in plugin directory
+     *
+     * @param string $template Template path
+     * @param string $template_name Template name
+     * @param string $template_path Template path prefix
+     * @return string Modified template path
+     */
+    public function locateTemplate(string $template, string $template_name, string $template_path): string
+    {
+        // Only handle our email templates
+        if (strpos($template_name, 'emails/license-') !== 0) {
+            return $template;
+        }
+
+        $plugin_template = WC_LICENSED_PRODUCT_PLUGIN_DIR . 'templates/' . $template_name;
+
+        if (file_exists($plugin_template)) {
+            return $plugin_template;
+        }
+
+        return $template;
     }
 
     /**
@@ -57,20 +100,48 @@ final class LicenseEmailController
      */
     public function sendExpirationWarnings(): void
     {
-        // Check for licenses expiring in 7 days
+        // Check if expiration emails are enabled in settings
-        $this->processExpirationWarnings(7, 'expiring_7_days');
+        if (!SettingsController::isExpirationEmailsEnabled()) {
+            return;
+        }
 
-        // Check for licenses expiring in 1 day
+        // Get the WooCommerce email instance
-        $this->processExpirationWarnings(1, 'expiring_1_day');
+        $mailer = WC()->mailer();
+        $emails = $mailer->get_emails();
+
+        if (!isset($emails['WCLP_License_Expiration'])) {
+            return;
+        }
+
+        /** @var LicenseExpirationEmail $expirationEmail */
+        $expirationEmail = $emails['WCLP_License_Expiration'];
+
+        // Check if the email is enabled
+        if (!$expirationEmail->is_enabled()) {
+            return;
+        }
+
+        // Get configurable warning days
+        $firstWarningDays = SettingsController::getFirstWarningDays();
+        $secondWarningDays = SettingsController::getSecondWarningDays();
+
+        // Check for licenses expiring at first warning threshold
+        $this->processExpirationWarnings($expirationEmail, $firstWarningDays, 'expiring_first_warning');
+
+        // Check for licenses expiring at second warning threshold (if enabled)
+        if ($secondWarningDays > 0 && $secondWarningDays < $firstWarningDays) {
+            $this->processExpirationWarnings($expirationEmail, $secondWarningDays, 'expiring_second_warning');
+        }
     }
 
     /**
      * Process and send expiration warnings for a specific time frame
      *
+     * @param LicenseExpirationEmail $email Email instance
      * @param int $days Days until expiration
      * @param string $notificationType Notification type identifier
      */
-    private function processExpirationWarnings(int $days, string $notificationType): void
+    private function processExpirationWarnings(LicenseExpirationEmail $email, int $days, string $notificationType): void
     {
         $licenses = $this->licenseManager->getLicensesExpiringSoon($days);
 
@@ -80,166 +151,14 @@ final class LicenseEmailController
                 continue;
             }
 
-            // Send the warning email
+            // Send the warning email using WooCommerce email system
-            if ($this->sendExpirationWarningEmail($license, $days)) {
+            if ($email->trigger($license, $days)) {
                 // Mark as notified
                 $this->licenseManager->markExpirationNotified($license->getId(), $notificationType);
             }
         }
     }
 
-    /**
-     * Send expiration warning email to customer
-     *
-     * @param \Jeremias\WcLicensedProduct\License\License $license License object
-     * @param int $daysRemaining Days until expiration
-     * @return bool Whether email was sent successfully
-     */
-    private function sendExpirationWarningEmail($license, int $daysRemaining): bool
-    {
-        $customer = get_userdata($license->getCustomerId());
-        if (!$customer || !$customer->user_email) {
-            return false;
-        }
-
-        $product = wc_get_product($license->getProductId());
-        $productName = $product ? $product->get_name() : __('Unknown Product', 'wc-licensed-product');
-
-        $siteName = get_bloginfo('name');
-        $expiresAt = $license->getExpiresAt();
-        $expirationDate = $expiresAt ? $expiresAt->format(get_option('date_format')) : '';
-
-        // Email subject
-        if ($daysRemaining === 1) {
-            $subject = sprintf(
-                /* translators: 1: Product name, 2: Site name */
-                __('[%2$s] Your license for %1$s expires tomorrow', 'wc-licensed-product'),
-                $productName,
-                $siteName
-            );
-        } else {
-            $subject = sprintf(
-                /* translators: 1: Product name, 2: Number of days, 3: Site name */
-                __('[%3$s] Your license for %1$s expires in %2$d days', 'wc-licensed-product'),
-                $productName,
-                $daysRemaining,
-                $siteName
-            );
-        }
-
-        // Email content
-        $message = $this->buildExpirationWarningHtml($license, $customer, $productName, $daysRemaining, $expirationDate);
-
-        // Send email
-        $headers = [
-            'Content-Type: text/html; charset=UTF-8',
-            'From: ' . $siteName . ' <' . get_option('admin_email') . '>',
-        ];
-
-        return wp_mail($customer->user_email, $subject, $message, $headers);
-    }
-
-    /**
-     * Build HTML content for expiration warning email
-     *
-     * @param \Jeremias\WcLicensedProduct\License\License $license License object
-     * @param \WP_User $customer Customer user object
-     * @param string $productName Product name
-     * @param int $daysRemaining Days until expiration
-     * @param string $expirationDate Formatted expiration date
-     * @return string HTML email content
-     */
-    private function buildExpirationWarningHtml($license, $customer, string $productName, int $daysRemaining, string $expirationDate): string
-    {
-        $siteName = get_bloginfo('name');
-        $siteUrl = home_url();
-        $accountUrl = wc_get_account_endpoint_url('licenses');
-
-        ob_start();
-        ?>
-        <!DOCTYPE html>
-        <html>
-        <head>
-            <meta charset="UTF-8">
-            <meta name="viewport" content="width=device-width, initial-scale=1.0">
-        </head>
-        <body style="font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; line-height: 1.6; color: #333; max-width: 600px; margin: 0 auto; padding: 20px;">
-            <div style="background: #f8f9fa; padding: 30px; border-radius: 8px;">
-                <h1 style="color: #333; margin-top: 0; font-size: 24px;">
-                    <?php esc_html_e('License Expiration Notice', 'wc-licensed-product'); ?>
-                </h1>
-
-                <p><?php printf(esc_html__('Hello %s,', 'wc-licensed-product'), esc_html($customer->display_name)); ?></p>
-
-                <?php if ($daysRemaining === 1): ?>
-                    <p style="color: #dc3545; font-weight: 600;">
-                        <?php printf(
-                            esc_html__('Your license for %s will expire tomorrow (%s).', 'wc-licensed-product'),
-                            esc_html($productName),
-                            esc_html($expirationDate)
-                        ); ?>
-                    </p>
-                <?php else: ?>
-                    <p style="color: #ffc107; font-weight: 600;">
-                        <?php printf(
-                            esc_html__('Your license for %1$s will expire in %2$d days (%3$s).', 'wc-licensed-product'),
-                            esc_html($productName),
-                            $daysRemaining,
-                            esc_html($expirationDate)
-                        ); ?>
-                    </p>
-                <?php endif; ?>
-
-                <div style="background: #fff; padding: 20px; border-radius: 4px; margin: 20px 0; border: 1px solid #e5e5e5;">
-                    <h3 style="margin-top: 0; font-size: 16px;"><?php esc_html_e('License Details', 'wc-licensed-product'); ?></h3>
-                    <table style="width: 100%; border-collapse: collapse;">
-                        <tr>
-                            <td style="padding: 8px 0; color: #666;"><?php esc_html_e('Product:', 'wc-licensed-product'); ?></td>
-                            <td style="padding: 8px 0; font-weight: 600;"><?php echo esc_html($productName); ?></td>
-                        </tr>
-                        <tr>
-                            <td style="padding: 8px 0; color: #666;"><?php esc_html_e('License Key:', 'wc-licensed-product'); ?></td>
-                            <td style="padding: 8px 0;">
-                                <code style="background: #f5f5f5; padding: 3px 8px; border-radius: 3px; font-family: monospace;">
-                                    <?php echo esc_html($license->getLicenseKey()); ?>
-                                </code>
-                            </td>
-                        </tr>
-                        <tr>
-                            <td style="padding: 8px 0; color: #666;"><?php esc_html_e('Domain:', 'wc-licensed-product'); ?></td>
-                            <td style="padding: 8px 0;"><?php echo esc_html($license->getDomain()); ?></td>
-                        </tr>
-                        <tr>
-                            <td style="padding: 8px 0; color: #666;"><?php esc_html_e('Expires:', 'wc-licensed-product'); ?></td>
-                            <td style="padding: 8px 0; color: #dc3545; font-weight: 600;"><?php echo esc_html($expirationDate); ?></td>
-                        </tr>
-                    </table>
-                </div>
-
-                <p><?php esc_html_e('To continue using this product, please renew your license before the expiration date.', 'wc-licensed-product'); ?></p>
-
-                <p style="margin-top: 25px;">
-                    <a href="<?php echo esc_url($accountUrl); ?>"
-                       style="display: inline-block; background: #2271b1; color: #fff; padding: 12px 24px; text-decoration: none; border-radius: 4px; font-weight: 600;">
-                        <?php esc_html_e('View My Licenses', 'wc-licensed-product'); ?>
-                    </a>
-                </p>
-
-                <hr style="border: none; border-top: 1px solid #e5e5e5; margin: 30px 0;">
-
-                <p style="font-size: 14px; color: #666; margin-bottom: 0;">
-                    <?php printf(
-                        esc_html__('This email was sent from %s.', 'wc-licensed-product'),
-                        '<a href="' . esc_url($siteUrl) . '" style="color: #2271b1;">' . esc_html($siteName) . '</a>'
-                    ); ?>
-                </p>
-            </div>
-        </body>
-        </html>
-        <?php
-        return ob_get_clean();
-    }
-
     /**
      * Add license information to order completed email
      */
@@ -281,7 +200,7 @@ final class LicenseEmailController
             echo "\n" . esc_html__('License Key:', 'wc-licensed-product') . ' ' . esc_html($license->getLicenseKey()) . "\n";
         } else {
             ?>
-            <div style="margin-top: 10px; padding: 10px; background-color: #f8f9fa; border-left: 3px solid #0073aa;">
+            <div style="margin-top: 10px; padding: 10px; background-color: #f8f9fa; border-left: 3px solid #7f54b3;">
                 <strong><?php esc_html_e('License Key:', 'wc-licensed-product'); ?></strong>
                 <code style="display: block; margin-top: 5px; padding: 5px; background: #fff; font-family: monospace;">
                     <?php echo esc_html($license->getLicenseKey()); ?>

src/Email/LicenseExpirationEmail.php

@@ -0,0 +1,240 @@
+<?php
+/**
+ * License Expiration Warning Email
+ *
+ * @package Jeremias\WcLicensedProduct\Email
+ */
+
+declare(strict_types=1);
+
+namespace Jeremias\WcLicensedProduct\Email;
+
+use Jeremias\WcLicensedProduct\License\License;
+use WC_Email;
+
+/**
+ * License Expiration Warning Email class
+ *
+ * Sends email notifications to customers when their licenses are about to expire.
+ */
+class LicenseExpirationEmail extends WC_Email
+{
+    /**
+     * License object
+     */
+    public ?License $license = null;
+
+    /**
+     * Days remaining until expiration
+     */
+    public int $days_remaining = 0;
+
+    /**
+     * Product name
+     */
+    public string $product_name = '';
+
+    /**
+     * Expiration date formatted
+     */
+    public string $expiration_date = '';
+
+    /**
+     * Constructor
+     */
+    public function __construct()
+    {
+        $this->id = 'wclp_license_expiration';
+        $this->customer_email = true;
+        $this->title = __('License Expiration Warning', 'wc-licensed-product');
+        $this->description = __('License expiration warning emails are sent to customers when their licenses are about to expire.', 'wc-licensed-product');
+
+        $this->template_html = 'emails/license-expiration.php';
+        $this->template_plain = 'emails/plain/license-expiration.php';
+        $this->template_base = WC_LICENSED_PRODUCT_PLUGIN_DIR . 'templates/';
+
+        $this->placeholders = [
+            '{site_title}' => $this->get_blogname(),
+            '{product_name}' => '',
+            '{days_remaining}' => '',
+            '{expiration_date}' => '',
+        ];
+
+        // Call parent constructor
+        parent::__construct();
+    }
+
+    /**
+     * Get email subject
+     */
+    public function get_default_subject(): string
+    {
+        return __('[{site_title}] Your license for {product_name} expires in {days_remaining} days', 'wc-licensed-product');
+    }
+
+    /**
+     * Get email heading
+     */
+    public function get_default_heading(): string
+    {
+        return __('License Expiration Notice', 'wc-licensed-product');
+    }
+
+    /**
+     * Trigger the email
+     *
+     * @param License $license License object
+     * @param int $days_remaining Days until expiration
+     */
+    public function trigger(License $license, int $days_remaining): bool
+    {
+        $this->setup_locale();
+
+        $customer = get_userdata($license->getCustomerId());
+        if (!$customer || !$customer->user_email) {
+            $this->restore_locale();
+            return false;
+        }
+
+        $this->license = $license;
+        $this->days_remaining = $days_remaining;
+        $this->recipient = $customer->user_email;
+
+        $product = wc_get_product($license->getProductId());
+        $this->product_name = $product ? $product->get_name() : __('Unknown Product', 'wc-licensed-product');
+
+        $expiresAt = $license->getExpiresAt();
+        $this->expiration_date = $expiresAt ? $expiresAt->format(get_option('date_format')) : '';
+
+        // Update placeholders
+        $this->placeholders['{product_name}'] = $this->product_name;
+        $this->placeholders['{days_remaining}'] = (string) $days_remaining;
+        $this->placeholders['{expiration_date}'] = $this->expiration_date;
+
+        if (!$this->is_enabled() || !$this->get_recipient()) {
+            $this->restore_locale();
+            return false;
+        }
+
+        $result = $this->send(
+            $this->get_recipient(),
+            $this->get_subject(),
+            $this->get_content(),
+            $this->get_headers(),
+            $this->get_attachments()
+        );
+
+        $this->restore_locale();
+
+        return $result;
+    }
+
+    /**
+     * Get content HTML
+     */
+    public function get_content_html(): string
+    {
+        return wc_get_template_html(
+            $this->template_html,
+            [
+                'license' => $this->license,
+                'days_remaining' => $this->days_remaining,
+                'product_name' => $this->product_name,
+                'expiration_date' => $this->expiration_date,
+                'email_heading' => $this->get_heading(),
+                'additional_content' => $this->get_additional_content(),
+                'sent_to_admin' => false,
+                'plain_text' => false,
+                'email' => $this,
+            ],
+            '',
+            $this->template_base
+        );
+    }
+
+    /**
+     * Get content plain text
+     */
+    public function get_content_plain(): string
+    {
+        return wc_get_template_html(
+            $this->template_plain,
+            [
+                'license' => $this->license,
+                'days_remaining' => $this->days_remaining,
+                'product_name' => $this->product_name,
+                'expiration_date' => $this->expiration_date,
+                'email_heading' => $this->get_heading(),
+                'additional_content' => $this->get_additional_content(),
+                'sent_to_admin' => false,
+                'plain_text' => true,
+                'email' => $this,
+            ],
+            '',
+            $this->template_base
+        );
+    }
+
+    /**
+     * Default content to show below main email content
+     */
+    public function get_default_additional_content(): string
+    {
+        return __('To continue using this product, please renew your license before the expiration date.', 'wc-licensed-product');
+    }
+
+    /**
+     * Initialize settings form fields
+     */
+    public function init_form_fields(): void
+    {
+        $placeholder_text = sprintf(
+            /* translators: %s: list of placeholders */
+            __('Available placeholders: %s', 'wc-licensed-product'),
+            '<code>{site_title}, {product_name}, {days_remaining}, {expiration_date}</code>'
+        );
+
+        $this->form_fields = [
+            'enabled' => [
+                'title' => __('Enable/Disable', 'wc-licensed-product'),
+                'type' => 'checkbox',
+                'label' => __('Enable this email notification', 'wc-licensed-product'),
+                'default' => 'yes',
+            ],
+            'subject' => [
+                'title' => __('Subject', 'wc-licensed-product'),
+                'type' => 'text',
+                'desc_tip' => true,
+                'description' => $placeholder_text,
+                'placeholder' => $this->get_default_subject(),
+                'default' => '',
+            ],
+            'heading' => [
+                'title' => __('Email heading', 'wc-licensed-product'),
+                'type' => 'text',
+                'desc_tip' => true,
+                'description' => $placeholder_text,
+                'placeholder' => $this->get_default_heading(),
+                'default' => '',
+            ],
+            'additional_content' => [
+                'title' => __('Additional content', 'wc-licensed-product'),
+                'description' => __('Text to appear below the main email content.', 'wc-licensed-product') . ' ' . $placeholder_text,
+                'css' => 'width:400px; height: 75px;',
+                'placeholder' => $this->get_default_additional_content(),
+                'type' => 'textarea',
+                'default' => '',
+                'desc_tip' => true,
+            ],
+            'email_type' => [
+                'title' => __('Email type', 'wc-licensed-product'),
+                'type' => 'select',
+                'description' => __('Choose which format of email to send.', 'wc-licensed-product'),
+                'default' => 'html',
+                'class' => 'email_type wc-enhanced-select',
+                'options' => $this->get_email_type_options(),
+                'desc_tip' => true,
+            ],
+        ];
+    }
+}

src/Product/LicensedProduct.php

@@ -11,6 +11,7 @@ namespace Jeremias\WcLicensedProduct\Product;
 
 use Jeremias\WcLicensedProduct\Admin\SettingsController;
 use WC_Product;
+use Jeremias\WcLicensedProduct\Product\VersionManager;
 
 /**
  * Licensed Product type extending WooCommerce Product
@@ -121,11 +122,14 @@ class LicensedProduct extends WC_Product
     }
 
     /**
-     * Get current software version
+     * Get current software version (derived from latest product version)
      */
     public function get_current_version(): string
     {
-        return $this->get_meta('_licensed_current_version', true) ?: '';
+        $versionManager = new VersionManager();
+        $latestVersion = $versionManager->getLatestVersion($this->get_id());
+
+        return $latestVersion ? $latestVersion->getVersion() : '';
     }
 
     /**
@@ -133,12 +137,13 @@ class LicensedProduct extends WC_Product
      */
     public function get_major_version(): int
     {
-        $version = $this->get_current_version();
+        $versionManager = new VersionManager();
-        if (empty($version)) {
+        $latestVersion = $versionManager->getLatestVersion($this->get_id());
-            return 1;
+
+        if ($latestVersion) {
+            return $latestVersion->getMajorVersion();
         }
 
-        $parts = explode('.', $version);
+        return 1;
-        return (int) ($parts[0] ?? 1);
     }
 }

src/Product/LicensedProductType.php

@@ -164,14 +164,6 @@ final class LicensedProductType
                     'value' => $currentBindToVersion ?: ($defaultBindToVersion ? 'yes' : 'no'),
                     'cbvalue' => 'yes',
                 ]);
-
-                woocommerce_wp_text_input([
-                    'id' => '_licensed_current_version',
-                    'label' => __('Current Version', 'wc-licensed-product'),
-                    'description' => __('Current software version (e.g., 1.0.0)', 'wc-licensed-product'),
-                    'desc_tip' => true,
-                    'placeholder' => '1.0.0',
-                ]);
                 ?>
             </div>
         </div>
@@ -223,12 +215,6 @@ final class LicensedProductType
         // phpcs:ignore WordPress.Security.NonceVerification.Missing
         $bindToVersion = isset($_POST['_licensed_bind_to_version']) ? 'yes' : 'no';
         update_post_meta($postId, '_licensed_bind_to_version', $bindToVersion);
-
-        // phpcs:ignore WordPress.Security.NonceVerification.Missing
-        $currentVersion = isset($_POST['_licensed_current_version'])
-            ? sanitize_text_field($_POST['_licensed_current_version'])
-            : '';
-        update_post_meta($postId, '_licensed_current_version', $currentVersion);
     }
 
     /**

templates/emails/license-expiration.php

@@ -0,0 +1,97 @@
+<?php
+/**
+ * License Expiration Warning Email (HTML)
+ *
+ * This template can be overridden by copying it to yourtheme/woocommerce/emails/license-expiration.php.
+ *
+ * @package Jeremias\WcLicensedProduct\Templates\Emails
+ * @version 0.0.8
+ *
+ * @var \Jeremias\WcLicensedProduct\License\License $license
+ * @var int $days_remaining
+ * @var string $product_name
+ * @var string $expiration_date
+ * @var string $email_heading
+ * @var string $additional_content
+ * @var bool $sent_to_admin
+ * @var bool $plain_text
+ * @var \Jeremias\WcLicensedProduct\Email\LicenseExpirationEmail $email
+ */
+
+defined('ABSPATH') || exit;
+
+/*
+ * @hooked WC_Emails::email_header() Output the email header
+ */
+do_action('woocommerce_email_header', $email_heading, $email);
+
+$customer = get_userdata($license->getCustomerId());
+$customer_name = $customer ? $customer->display_name : __('Customer', 'wc-licensed-product');
+$account_url = wc_get_account_endpoint_url('licenses');
+?>
+
+<p><?php printf(esc_html__('Hello %s,', 'wc-licensed-product'), esc_html($customer_name)); ?></p>
+
+<?php if ($days_remaining === 1) : ?>
+    <p style="color: #dc3545; font-weight: 600;">
+        <?php printf(
+            esc_html__('Your license for %s will expire tomorrow (%s).', 'wc-licensed-product'),
+            esc_html($product_name),
+            esc_html($expiration_date)
+        ); ?>
+    </p>
+<?php else : ?>
+    <p style="color: #856404; font-weight: 600;">
+        <?php printf(
+            esc_html__('Your license for %1$s will expire in %2$d days (%3$s).', 'wc-licensed-product'),
+            esc_html($product_name),
+            $days_remaining,
+            esc_html($expiration_date)
+        ); ?>
+    </p>
+<?php endif; ?>
+
+<h2><?php esc_html_e('License Details', 'wc-licensed-product'); ?></h2>
+
+<div style="margin-bottom: 40px;">
+    <table class="td" cellspacing="0" cellpadding="6" style="width: 100%; font-family: 'Helvetica Neue', Helvetica, Roboto, Arial, sans-serif;" border="1">
+        <tbody>
+            <tr>
+                <th class="td" scope="row" style="text-align:left;"><?php esc_html_e('Product:', 'wc-licensed-product'); ?></th>
+                <td class="td" style="text-align:left;"><?php echo esc_html($product_name); ?></td>
+            </tr>
+            <tr>
+                <th class="td" scope="row" style="text-align:left;"><?php esc_html_e('License Key:', 'wc-licensed-product'); ?></th>
+                <td class="td" style="text-align:left;">
+                    <code style="background: #f5f5f5; padding: 3px 8px; border-radius: 3px; font-family: monospace;">
+                        <?php echo esc_html($license->getLicenseKey()); ?>
+                    </code>
+                </td>
+            </tr>
+            <tr>
+                <th class="td" scope="row" style="text-align:left;"><?php esc_html_e('Domain:', 'wc-licensed-product'); ?></th>
+                <td class="td" style="text-align:left;"><?php echo esc_html($license->getDomain()); ?></td>
+            </tr>
+            <tr>
+                <th class="td" scope="row" style="text-align:left;"><?php esc_html_e('Expires:', 'wc-licensed-product'); ?></th>
+                <td class="td" style="text-align:left; color: #dc3545; font-weight: 600;"><?php echo esc_html($expiration_date); ?></td>
+            </tr>
+        </tbody>
+    </table>
+</div>
+
+<?php if ($additional_content) : ?>
+    <p><?php echo wp_kses_post($additional_content); ?></p>
+<?php endif; ?>
+
+<p style="margin-top: 25px;">
+    <a href="<?php echo esc_url($account_url); ?>" style="display: inline-block; background: #7f54b3; color: #fff; padding: 12px 24px; text-decoration: none; border-radius: 4px; font-weight: 600;">
+        <?php esc_html_e('View My Licenses', 'wc-licensed-product'); ?>
+    </a>
+</p>
+
+<?php
+/*
+ * @hooked WC_Emails::email_footer() Output the email footer
+ */
+do_action('woocommerce_email_footer', $email);

templates/emails/plain/license-expiration.php

@@ -0,0 +1,64 @@
+<?php
+/**
+ * License Expiration Warning Email (Plain Text)
+ *
+ * This template can be overridden by copying it to yourtheme/woocommerce/emails/plain/license-expiration.php.
+ *
+ * @package Jeremias\WcLicensedProduct\Templates\Emails
+ * @version 0.0.8
+ *
+ * @var \Jeremias\WcLicensedProduct\License\License $license
+ * @var int $days_remaining
+ * @var string $product_name
+ * @var string $expiration_date
+ * @var string $email_heading
+ * @var string $additional_content
+ * @var bool $sent_to_admin
+ * @var bool $plain_text
+ * @var \Jeremias\WcLicensedProduct\Email\LicenseExpirationEmail $email
+ */
+
+defined('ABSPATH') || exit;
+
+echo "=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=\n";
+echo esc_html(wp_strip_all_tags($email_heading));
+echo "\n=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=\n\n";
+
+$customer = get_userdata($license->getCustomerId());
+$customer_name = $customer ? $customer->display_name : __('Customer', 'wc-licensed-product');
+
+echo sprintf(esc_html__('Hello %s,', 'wc-licensed-product'), esc_html($customer_name)) . "\n\n";
+
+if ($days_remaining === 1) {
+    echo sprintf(
+        esc_html__('Your license for %s will expire tomorrow (%s).', 'wc-licensed-product'),
+        esc_html($product_name),
+        esc_html($expiration_date)
+    ) . "\n\n";
+} else {
+    echo sprintf(
+        esc_html__('Your license for %1$s will expire in %2$d days (%3$s).', 'wc-licensed-product'),
+        esc_html($product_name),
+        $days_remaining,
+        esc_html($expiration_date)
+    ) . "\n\n";
+}
+
+echo "----------\n";
+echo esc_html__('License Details', 'wc-licensed-product') . "\n";
+echo "----------\n\n";
+
+echo esc_html__('Product:', 'wc-licensed-product') . ' ' . esc_html($product_name) . "\n";
+echo esc_html__('License Key:', 'wc-licensed-product') . ' ' . esc_html($license->getLicenseKey()) . "\n";
+echo esc_html__('Domain:', 'wc-licensed-product') . ' ' . esc_html($license->getDomain()) . "\n";
+echo esc_html__('Expires:', 'wc-licensed-product') . ' ' . esc_html($expiration_date) . "\n\n";
+
+if ($additional_content) {
+    echo "----------\n\n";
+    echo esc_html(wp_strip_all_tags(wptexturize($additional_content)));
+    echo "\n\n";
+}
+
+echo esc_html__('View My Licenses', 'wc-licensed-product') . ': ' . esc_url(wc_get_account_endpoint_url('licenses')) . "\n\n";
+
+echo "=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=\n";

wc-licensed-product.php

@@ -3,7 +3,7 @@
  * Plugin Name: WooCommerce Licensed Product
  * Plugin URI: https://src.bundespruefstelle.ch/magdev/wc-licensed-product
  * Description: WooCommerce plugin to sell software products using license keys with domain-based validation.
- * Version: 0.0.7
+ * Version: 0.0.8
  * Author: Marco Graetsch
  * Author URI: https://src.bundespruefstelle.ch/magdev
  * License: GPL-2.0-or-later
@@ -28,7 +28,7 @@ if (!defined('ABSPATH')) {
 }
 
 // Plugin constants
-define('WC_LICENSED_PRODUCT_VERSION', '0.0.7');
+define('WC_LICENSED_PRODUCT_VERSION', '0.0.8');
 define('WC_LICENSED_PRODUCT_PLUGIN_FILE', __FILE__);
 define('WC_LICENSED_PRODUCT_PLUGIN_DIR', plugin_dir_path(__FILE__));
 define('WC_LICENSED_PRODUCT_PLUGIN_URL', plugin_dir_url(__FILE__));