How to Add Custom Endpoints to Woocommerce Account Pages?

// Add Custom Endpoints to Woocommerce Account Pages
// Exit if accessed directly
if (!defined('ABSPATH')) {
    exit;
}

/**
 * Register 'Custom Endpoints' Custom Post Type with Gutenberg Support
 */
function register_custom_endpoints_cpt() {
    $args = array(
        'labels' => array(
            'name'               => __('Custom Endpoints', 'your-textdomain'),
            'singular_name'      => __('Custom Endpoint', 'your-textdomain'),
            'menu_name'          => __('Custom Endpoints', 'your-textdomain'),
            'add_new'            => __('Add New', 'your-textdomain'),
            'add_new_item'       => __('Add New Custom Endpoint', 'your-textdomain'),
            'edit_item'          => __('Edit Custom Endpoint', 'your-textdomain'),
            'new_item'           => __('New Custom Endpoint', 'your-textdomain'),
        ),
        'public'        => false,
        'show_ui'       => true,
        'show_in_menu'  => 'woocommerce',
        'capability_type' => 'post',
        'hierarchical'  => false,
        'supports'      => array('title', 'editor'),
        'menu_icon'     => 'dashicons-admin-links',
        'show_in_rest'  => true, // Enables Gutenberg support
    );

    register_post_type('custom_wc_endpoint', $args);
}
add_action('init', 'register_custom_endpoints_cpt');

/**
 * Register Endpoint Query Variable
 */
function add_custom_wc_query_vars($vars) {
    $vars[] = 'custom_wc_endpoint';
    return $vars;
}
add_filter('query_vars', 'add_custom_wc_query_vars');

/**
 * Add Custom Endpoints to WooCommerce My Account Page
 */
function add_custom_wc_endpoints() {
    $args = array(
        'post_type'      => 'custom_wc_endpoint',
        'posts_per_page' => -1,
        'post_status'    => 'publish',
    );
    
    $endpoints = get_posts($args);
    
    foreach ($endpoints as $endpoint) {
        $slug = sanitize_title($endpoint->post_title);
        add_rewrite_endpoint($slug, EP_ROOT | EP_PAGES);
    }
    
    flush_rewrite_rules(); // Auto flush permalinks
}
add_action('init', 'add_custom_wc_endpoints', 10);

/**
 * Register Custom Endpoints with WooCommerce My Account Menu (Before Log Out)
 */
function register_custom_wc_account_menu_items($items) {
    $logout = $items['customer-logout'];
    unset($items['customer-logout']);
    
    $args = array(
        'post_type'      => 'custom_wc_endpoint',
        'posts_per_page' => -1,
        'post_status'    => 'publish',
    );
    
    $endpoints = get_posts($args);
    
    foreach ($endpoints as $endpoint) {
        $slug = sanitize_title($endpoint->post_title);
        if (!empty($slug)) {
            $items[$slug] = esc_html($endpoint->post_title);
        }
    }
    
    $items['customer-logout'] = $logout; // Move Log Out to the bottom
    
    return $items;
}
add_filter('woocommerce_account_menu_items', 'register_custom_wc_account_menu_items', 20);

/**
 * Display Custom Endpoint Content on My Account Page
 */
function display_custom_wc_endpoint_content() {
    global $wp;

    // Get all custom endpoint slugs
    $args = array(
        'post_type'      => 'custom_wc_endpoint',
        'posts_per_page' => -1,
        'post_status'    => 'publish',
        'fields'         => 'ids', // Optimize query by only fetching IDs
    );

    $endpoints = get_posts($args);
    $endpoint_slugs = array();

    foreach ($endpoints as $endpoint_id) {
        $endpoint_slugs[] = sanitize_title(get_the_title($endpoint_id));
    }

    // Find the custom endpoint slug in the query vars
    $slug = '';
    foreach ($wp->query_vars as $key => $value) {
        if (in_array($key, $endpoint_slugs)) {
            $slug = $key;
            break;
        }
    }

    if (empty($slug)) {
        echo '<h2>Oops! Content not found</h2>';
        return;
    }

    // Get the custom endpoint post by slug
    $args = array(
        'name'           => $slug,
        'post_type'      => 'custom_wc_endpoint',
        'post_status'    => 'publish',
        'posts_per_page' => 1,
    );

    $custom_endpoint = get_posts($args);

    if (!empty($custom_endpoint)) {
        echo '<div class="woocommerce-custom-endpoint-content">';
        echo apply_filters('the_content', $custom_endpoint[0]->post_content);
        echo '</div>';
    } else {
        echo '<h2>Oops! Content not found</h2>';
    }
}

/**
 * Hook Endpoint Content Display to WooCommerce My Account Page
 */
function hook_custom_wc_endpoints() {
    $args = array(
        'post_type'      => 'custom_wc_endpoint',
        'posts_per_page' => -1,
        'post_status'    => 'publish',
    );

    $endpoints = get_posts($args);

    foreach ($endpoints as $endpoint) {
        $slug = sanitize_title($endpoint->post_title);
        add_action('woocommerce_account_' . $slug . '_endpoint', 'display_custom_wc_endpoint_content');
    }
}
add_action('init', 'hook_custom_wc_endpoints');

/**
 * Flush Rewrite Rules on Activation
 */
function force_flush_permalinks_on_activation() {
    add_custom_wc_endpoints();
    flush_rewrite_rules();
}
register_activation_hook(__FILE__, 'force_flush_permalinks_on_activation');