Add custom menu item and endpoint to WooCommerce my-account page

add-custom-menu-item-and-endpoint-to-woocommerce-my-account-page.php

/* Add custom menu item and endpoint to WooCommerce My-Account page */

function my_custom_endpoints() {
    add_rewrite_endpoint( 'refunds-returns', EP_ROOT | EP_PAGES );
}

add_action( 'init', 'my_custom_endpoints' );

function my_custom_query_vars( $vars ) {
    $vars[] = 'refunds-returns';

    return $vars;
}

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

function my_custom_flush_rewrite_rules() {
    flush_rewrite_rules();
}

add_action( 'after_switch_theme', 'my_custom_flush_rewrite_rules' );

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' ),
        'refunds-returns'      => 'Refunds & Returns',
        'customer-logout'   => __( 'Logout', 'woocommerce' ),
    );

    return $items;
}

add_filter( 'woocommerce_account_menu_items', 'my_custom_my_account_menu_items' );

function my_custom_endpoint_content() {
    include 'woocommerce/myaccount/refunds-returns.php'; 
}

add_action( 'woocommerce_account_refunds-returns_endpoint', 'my_custom_endpoint_content' );

Nice, Only thing left is using

wc_get_template( 'myaccount/refunds-returns.php');

instead of

include 'woocommerce/myaccount/refunds-returns.php';

New updated version
https://gist.github.com/alhoseany/44f354d3375c924c3e185ab5be31aabd