Omnipay\Common\Message\AbstractRequest::getCardReference PHP 메소드

    public function getCardReference()
    {
        return $this->getParameter('cardReference');
    }

 /**
  * @param bool $serialize Determines whether the return value will be a string or object
  * @return string|CardReference
  */
 public function getCardReference($serialize = true)
 {
     $value = parent::getCardReference();
     if ($serialize) {
         $value = (string) $value;
     }
     return $value;
 }