public function getErrorDescription()
    {
        if (isset($this->responseObj->code) && !empty($this->responseObj->code)) {
            return Constants\Errors::getErrorDescription($this->responseObj->code);
        }

        if (isset($this->responseObj->response_code) && !empty($this->responseObj->response_code)) {
            return Constants\Errors::getIssuerResponseCode($this->responseObj->response_code);
        }

        return null;
    }