Wocommerce Vnpay: Update status and empty cart

<?php
 
require_once($_SERVER['DOCUMENT_ROOT'].'/wp-load.php');
global $woocommerce;
$inputData = array();
$returnData = array();
$txnResponseCode = $_GET["vnp_ResponseCode"];
$order = new WC_Order($_GET["vnp_TxnRef"]);
// echo $order = getOrder(864);
$secureHash = $_GET["vnp_SecureHash"];
 
if ($txnResponseCode == '00') {
	$woocommerce->cart->empty_cart();
    $returnData['RspCode'] = '00';
    $returnData['Message'] = 'Confirm Success';
    $returnData['Signature'] = $secureHash;
	$order->add_order_note(__($transStatus, 'woocommerce'));
	$order->update_status('completed');
}
else {
	$woocommerce->cart->empty_cart();
    $returnData['RspCode'] = '00';
    $returnData['Message'] = 'Confirm Success';
    $returnData['Signature'] = $secureHash;
    $order->add_order_note(__($transStatus, 'woocommerce'));
    $order->update_status('failed');
 
}
echo json_encode($returnData);
?>