src/Notify/NotifyStrategy.php
protected function callback(PayNotifyInterface $notify, array $notifyData)
    {
        $data = $this->getRetData($notifyData);

        if ($data === false) {
            return false;
        }

        return $notify->notifyProcess($data);
    }
protected function callback(PayNotifyInterface $notify, array $notifyData)
    {
        $data = $this->getRetData($notifyData);

        if ($data === false) {
            return false;
        }

        return $notify->notifyProcess($data);
    }
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