code: protected function callback(PayNotifyInterface $notify, array $notifyData)
      {
          $data = $this->getRetData($notifyData);
  
          if ($data === false) {
              return false;
          }
  
          return $notify->notifyProcess($data);
      }
docs: 回调商户的业务逻辑，根据返回的true  或者 false  向第三方返回数据
  @param PayNotifyInterface $notify
  @param array $notifyData
  
  @return boolean
  @author helei