贝宝多次点击通知网址

我已经通过贝宝（Paypal）自适应付款进行了付款，并且付款成功

然后我发送验证请求，但我得到status = VERIFIED

这是代码：

function process_new() {
$req = 'cmd=_notify-validate&'.file_get_contents("php://input");
$ipnmsg=$this->decodePayPalIPN($req);
$ch = curl_init('https://www.sandbox.paypal.com/cgi-bin/webscr');
curl_setopt($ch, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $req);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 1);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);
curl_setopt($ch, CURLOPT_FORBID_REUSE, 1);
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Connection: Close'));
$res=curl_exec($ch);
curl_close($ch);
    //if ($this->InstantPaymentNotification->is_valid($req)) 
    if($res=='VERIFIED') // i got verified here
    {
        $txnIds=array();
        $notifications = $this->InstantPaymentNotification->buildAssociationsFromIPN_new($ipnmsg);
        foreach($notifications as $notification){
            $this->IpnNotification->create();
            $this->IpnNotification->save($notification);
            $txnIds[]=$this->IpnNotification->id;
            }
       //$this->InstantPaymentNotificationNew->saveAll($notification);
        $this->__processTransactionNew($txnIds);
    }

    //$this->redirect('/');
}

无法找到notify_url持续命中的原因。

如果需要更多信息，我也将其发布...

这是IPN历史：

  `$code = curl_getinfo($curl, CURLINFO_HTTP_CODE);`

它返回200，但仍然在Paypal上显示HTTP状态代码：500

并且通知网址：http : //example.com/instant_payment_notifications/process_new不返回HTTP状态码：500

谢谢。