public function get_undo_url($cart_item_key)
{
$cart_page_url = wc_get_page_permalink('cart');
$query_args = array('undo_item' => $cart_item_key);
return apply_filters('woocommerce_get_undo_url', $cart_page_url ? wp_nonce_url(add_query_arg($query_args, $cart_page_url), 'woocommerce-cart') : '', $cart_item_key);
}