WooCommerce: Assigning an endpoint to a custom template in my account pages

Question

This function adds a tab named "Special Page" into "My Account" tab list:

add_filter( 'woocommerce_account_menu_items' , 'jc_menu_panel_nav' );

function jc_menu_panel_nav() {
    $items = array(
        'dashboard'       => __( 'Dashboard', 'woocommerce' ),
        'orders'          => __( 'Orders', 'woocommerce' ),
        'downloads'       => __( 'Downloads', 'woocommerce' ),
        'edit-address'    => __( 'Addresses', 'woocommerce' ),
        'payment-methods' => __( 'Payment Methods', 'woocommerce' ),
        'edit-account'    => __( 'Account Details', 'woocommerce' ),
        'special-page' => __( 'Special Page', 'woocommerce' ), // My custom tab here
        'customer-logout' => __( 'Logout', 'woocommerce' ),
    );

    return $items;
}

That results in this:

But the link points to my-account/special-page/, and naturally gives a 404 error.

How I can assign this URL to a file named special-page.php?

Answer 1

Finally I could solve the problem using a snippet provided for the same people of WooCommerce (There are more tips in that page). For anyone interested, paste all the following code in functions.php:

function my_custom_endpoints() {
    add_rewrite_endpoint( 'special-page', EP_ROOT | EP_PAGES );
}

add_action( 'init', 'my_custom_endpoints' );

function my_custom_query_vars( $vars ) {
    $vars[] = 'special-page';

    return $vars;
}

add_filter( 'query_vars', 'my_custom_query_vars', 0 );

function my_custom_flush_rewrite_rules() {
    flush_rewrite_rules();
}

add_action( 'wp_loaded', 'my_custom_flush_rewrite_rules' );

I think this way allows more control to order/renaming the menu:

function my_custom_my_account_menu_items( $items ) {
    $items = array(
        'dashboard'         => __( 'Dashboard', 'woocommerce' ),
        'orders'            => __( 'Orders', 'woocommerce' ),
        //'downloads'       => __( 'Downloads', 'woocommerce' ),
        //'edit-address'    => __( 'Addresses', 'woocommerce' ),
        //'payment-methods' => __( 'Payment Methods', 'woocommerce' ),
        'edit-account'      => __( 'Edit Account', 'woocommerce' ),
        'special-page'      => 'Special Page',
        'customer-logout'   => __( 'Logout', 'woocommerce' ),
    );

    return $items;
}

add_filter( 'woocommerce_account_menu_items', 'my_custom_my_account_menu_items' );

In the following function I included the file to maintain some "order", but it also admits direct code.

Be sure to place the special-page.php file in the myaccount folder.

function my_custom_endpoint_content() {
    include 'woocommerce/myaccount/special-page.php'; 
}

add_action( 'woocommerce_account_special-page_endpoint', 'my_custom_endpoint_content' );

Important: Once did this, go to Dashboard > Settings > Permalinks and click "Save Settings" in order to flush rewrite rules (thanks @optimiertes)

Source: Tabbed My Account page