Как исправить URL-адрес возврата в Vtiger, добавив & quot;? Success = ok & quot; на URL?

VTiger добавляет «? Success = ok» в URL возврата моей веб-формы. Я не могу понять, как это исправить. Я думаю, что проблема в файле php ниже.

<?php

// Switch the working directory to base
chdir(dirname(__FILE__) . '/../..');

include_once 'include/Zend/Json.php';
include_once 'vtlib/Vtiger/Module.php';
include_once 'include/utils/VtlibUtils.php';
include_once 'include/Webservices/Create.php';
include_once 'modules/Webforms/model/WebformsModel.php';
include_once 'modules/Webforms/model/WebformsFieldModel.php';
include_once 'include/QueryGenerator/QueryGenerator.php';
include_once 'includes/main/WebUI.php';

class Webform_Capture {

function captureNow($request) {
$currentLanguage = Vtiger_Language_Handler::getLanguage();
$moduleLanguageStrings =                             Vtiger_Language_Handler::getModuleStringsFromFile($currentLanguage);
vglobal('app_strings', $moduleLanguageStrings['languageStrings']);

$returnURL = false;
try {
if(!vtlib_isModuleActive('Webforms')) throw new Exception('webforms is not active');

$webform = Webforms_Model::retrieveWithPublicId(vtlib_purify($request['publicid']));
if (empty($webform)) throw new Exception("Webform not found.");

$returnURL = $webform->getReturnUrl();
$roundrobin = $webform->getRoundrobin();

// Retrieve user information
$user = CRMEntity::getInstance('Users');
$user->id=$user->getActiveAdminId();
$user->retrieve_entity_info($user->id, 'Users');

// Prepare the parametets
$parameters = array();
$webformFields = $webform->getFields();
foreach ($webformFields as $webformField) {
if($webformField->getDefaultValue()!=null){
$parameters[$webformField->getFieldName()] = decode_html($webformField->getDefaultValue());
}else{
$webformNeutralizedField = html_entity_decode($webformField->getNeutralizedField(),ENT_COMPAT,"UTF-8");
if(is_array(vtlib_purify($request[$webformNeutralizedField]))){
$fieldData=implode(" |##| ",vtlib_purify($request[$webformNeutralizedField]));
}
else{
$fieldData=vtlib_purify($request[$webformNeutralizedField]);
$fieldData = decode_html($fieldData);
}

$parameters[$webformField->getFieldName()] = stripslashes($fieldData);
}
if($webformField->getRequired()){
if(!isset($parameters[$webformField->getFieldName()]))  throw new Exception("Required fields not filled");
}
}

if($roundrobin){
$ownerId = $webform->getRoundrobinOwnerId();
$ownerType = vtws_getOwnerType($ownerId);
$parameters['assigned_user_id'] = vtws_getWebserviceEntityId($ownerType, $ownerId);
}
else{
$ownerId = $webform->getOwnerId();
$ownerType = vtws_getOwnerType($ownerId);
$parameters['assigned_user_id'] = vtws_getWebserviceEntityId($ownerType, $ownerId);
}

// Create the record
$record=vtws_create($webform->getTargetModule(), $parameters, $user);

$this->sendResponse($returnURL, 'ok');
return;

} catch (Exception $e) {
$this->sendResponse($returnURL, false, $e->getMessage());
return;
}
}

protected function sendResponse($url, $success=false, $failure=false) {
if (empty($url)) {
if ($success) $response = Zend_Json::encode(array('success' => true, 'result' => $success));
else $response = Zend_Json::encode(array('success' => false, 'error' => array('message' => $failure)));

// Support JSONP
if (!empty($_REQUEST['callback'])) {
$callback = vtlib_purify($_REQUEST['callback']);
echo sprintf("%s(%s)", $callback, $response);
} else {
echo $response;
}
} else {
$pos = strpos($url, 'http');
if($pos !== false){
header(sprintf("Location: %s?%s=%s", $url, ($success? 'success' : 'error'), ($success? $success: $failure)));
}else{
header(sprintf("Location: http://%s?%s=%s", $url, ($success? 'success' : 'error'), ($success? $success: $failure)));
}
}
}

}

// NOTE: Take care of stripping slashes...
$webformCapture = new Webform_Capture();
$webformCapture->captureNow($_REQUEST);
?>

Я знаю, что это, вероятно, действительно легко, но я недостаточно знаком с PHP, чтобы это исправить.

заранее спасибо