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