PayPal\Service\PayPalAPIInterfaceServiceService::DoNonReferencedCredit PHP Method

    public function DoNonReferencedCredit($doNonReferencedCreditReq, $apiCredential = null)
    {
        $apiContext = new PPApiContext($this->config);
        $handlers = array(new PPMerchantServiceHandler($apiCredential, self::$SDK_NAME, self::$SDK_VERSION));
        $this->setStandardParams($doNonReferencedCreditReq->DoNonReferencedCreditRequest);
        $ret = new DoNonReferencedCreditResponseType();
        $resp = $this->call('PayPalAPIAA', 'DoNonReferencedCredit', $doNonReferencedCreditReq, $apiContext, $handlers);
        $ret->init(PPUtils::xmlToArray($resp));
        return $ret;
    }

$doNonRefCreditRequestDetails->Comment = $_REQUEST['comment'];
$doNonRefCreditRequestDetails->NetAmount = $itemAmount;
$doNonRefCreditRequestDetails->ShippingAmount = $shippingAmount;
$doNonRefCreditRequestDetails->TaxAmount = $taxAmount;
$doNonRefCreditRequestDetails->Amount = $totalamount;
$doNonRefCreditRequest = new DoNonReferencedCreditRequestType();
$doNonRefCreditRequest->DoNonReferencedCreditRequestDetails = $doNonRefCreditRequestDetails;
$doNonRefCreditReq = new DoNonReferencedCreditReq();
$doNonRefCreditReq->DoNonReferencedCreditRequest = $doNonRefCreditRequest;
/*
 * 	 ## Creating service wrapper object
Creating service wrapper object to make API call and loading
Configuration::getAcctAndConfig() returns array that contains credential and config parameters
*/
$paypalService = new PayPalAPIInterfaceServiceService(Configuration::getAcctAndConfig());
try {
    /* wrap API method calls on the service object with a try catch */
    $doNonRefCreditResponse = $paypalService->DoNonReferencedCredit($doNonRefCreditReq);
} catch (Exception $ex) {
    include_once "../Error.php";
    exit;
}
if (isset($doNonRefCreditResponse)) {
    echo "<table>";
    echo "<tr><td>Ack :</td><td><div id='Ack'>{$doNonRefCreditResponse->Ack}</div> </td></tr>";
    echo "</table>";
    echo "<pre>";
    print_r($doNonRefCreditResponse);
    echo "</pre>";
}
require_once '../Response.php';