Display coupons used in an order in woocommerce

Use any order hooks.  here we get the deatils of coupen once cancelled the order from orders list

add_action(‘woocommerce_order_status_cancelled’, ‘order_cancelled_woo’);
order_cancelled_woo($order_id){

$order = new WC_Order($order_id);
$coupens= $order->get_used_coupons();
file_put_contents(‘filename1.txt’,print_r($coupens,true));
}