Fix licenses endpoint 404 error in customer account

- Register licenses query var with WooCommerce via woocommerce_get_query_vars
- Register endpoint in Installer before flushing rewrite rules
- Existing installations need to re-save permalinks

The endpoint was not being recognized because WooCommerce's My Account
requires both add_rewrite_endpoint() and query var registration.

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

CLAUDE.md

@@ -553,3 +553,18 @@ Full API documentation available in `openapi.json` (OpenAPI 3.1 specification).
 - Domain validation with normalization (strips protocol, www prefix)
 - Inline edit UI with save/cancel for license domains
 - Links to full licenses management page for advanced actions
+
+**Bug fix (post v0.0.10):**
+
+- Fixed: Licenses menu item in customer account page resulted in 404 error
+
+**Root cause:**
+
+- WooCommerce My Account endpoints require both `add_rewrite_endpoint()` AND registration with `woocommerce_get_query_vars` filter
+- The endpoint also needs to be registered before rewrite rules are flushed during activation
+
+**Fix:**
+
+- Added `addLicensesQueryVar()` method to register the endpoint query var with WooCommerce
+- Updated Installer to register endpoint before flushing rewrite rules on activation
+- Existing installations may need to visit Settings > Permalinks and click Save to regenerate rewrite rules

src/Frontend/AccountController.php

@@ -44,6 +44,9 @@ final class AccountController
         // Add licenses endpoint
         add_action('init', [$this, 'addLicensesEndpoint']);
 
+        // Register endpoint query var with WooCommerce
+        add_filter('woocommerce_get_query_vars', [$this, 'addLicensesQueryVar']);
+
         // Add licenses menu item
         add_filter('woocommerce_account_menu_items', [$this, 'addLicensesMenuItem']);
 
@@ -65,6 +68,15 @@ final class AccountController
         add_rewrite_endpoint('licenses', EP_ROOT | EP_PAGES);
     }
 
+    /**
+     * Register licenses query var with WooCommerce
+     */
+    public function addLicensesQueryVar(array $vars): array
+    {
+        $vars['licenses'] = 'licenses';
+        return $vars;
+    }
+
     /**
      * Add licenses menu item to My Account navigation
      */

src/Installer.php

@@ -35,7 +35,10 @@ final class Installer
         // Set version in options
         update_option('wc_licensed_product_version', WC_LICENSED_PRODUCT_VERSION);
 
-        // Flush rewrite rules for REST API
+        // Register the licenses endpoint before flushing rewrite rules
+        add_rewrite_endpoint('licenses', EP_ROOT | EP_PAGES);
+
+        // Flush rewrite rules for REST API and My Account endpoints
         flush_rewrite_rules();
     }