PayPal IPN 侦听器脚本永远不会停止执行

Question

我有一个 PHP 网页，它使用创建发票并允许用户通过 PayPal 付款。该脚本通过 https 识别 IPN 监听页面，并在用户完成交易后调用该页面。在调用的 IPN 脚本中，我将发票状态更新为“已付款”以及成功付款后的其他相关信息。好消息是所有功能都完美无缺。但是，当我在例程中向获得销售额百分比的供应商添加单笔付款时，脚本会一遍又一遍地执行并且永不停止。似乎造成问题的脚本部分是

        case "Completed":
        $vBody = "PayPal has identifed this transaction as Completed.  Your account will be credited.";
        // BEGIN MassPay API Call
        // Create PayPal object.
        $PayPalConfig = array(
            'Sandbox' => $sandbox,
            'APIUsername' => $api_username,
            'APIPassword' => $api_password,
            'APISignature' => $api_signature,
            'PrintHeaders' => $print_headers,
            'LogResults' => $log_results,
            'LogPath' => $log_path,
            );
        $PayPal = new angelleye\PayPal\PayPal($PayPalConfig);
        // Prepare request arrays
        $MPFields = array(
                'emailsubject' => 'Notification of Payment',    // The subject line of the email that PayPal sends when the transaction is completed.  Same for all recipients.  255 char max.
                'currencycode' => 'USD',                                // Three-letter currency code.
                'receivertype' => 'EmailAddress'                        // Indicates how you identify the recipients of payments in this call to MassPay.  Must be EmailAddress or UserID
            );
        // Build MPItems array. 
        $Item1 = array(
                'l_email' => 'recipient@gmail.com',                 // Required.  Email address of recipient.  You must specify either L_EMAIL or L_RECEIVERID but you must not mix the two.
                'l_receiverid' => '',                                   // Required.  ReceiverID of recipient.  Must specify this or email address, but not both.
                'l_amt' => '3.00',                                      // Required.  Payment amount.
                'l_uniqueid' => $Post["invoice"],                       // Transaction-specific ID number for tracking in an accounting system.
                'l_note' => 'Payment per PayPal transaction processing fee.'                                // Custom note for each recipient.
        );
        $MPItems = array($Item1);
        //$MPItems = $Item1;  // ($Item1, $Item2, etc
        $PayPalRequestData = array('MPFields'=>$MPFields, 'MPItems' => $MPItems);
        // Pass data into class for processing with PayPal and load the response array into $PayPalResult
        $PayPalResult = $PayPal->MassPay($PayPalRequestData);
        // END MassPay API Call
        //Update database on succcessful payment

脚本执行良好，沙盒中向供应商的大规模付款有效，但它从未停止。如果我使用它完成交易，发件人的 PayPal 帐户将耗尽所有资金。我已经读到沙盒可能存在问题，但不确定这是否准确，我无法将其投入生产。谁能告诉我如何解决或识别问题？

Answer 1

尝试使用：

 break;

或者：

exit();

这会导致脚本在第一次执行后停止执行