PayPal IPN 有时不更新数据库

如何解决PayPal IPN 有时不更新数据库

几个星期以来，PayPal 没有为某些交易更新我的数据库。也许 10 个事务中有 3 个被添加到数据库中。不知道发生了什么。在此之前，一切都很好。没有错误，PayPal 历史记录中的每笔交易都已完成。我不知道问题出在哪里。

这是我的 ipn.php

<?php
    if (gethostbyaddr($_SERVER['REMOTE_ADDR']) !== 'notify.paypal.com') {
        exit();
    }

    // Require the functions to connect to database and fetch config values
    require 'config.php';
    require 'db.php';
    
    // Fetch and sanitize POST and GET values
    function getValue($value) {
        return (!empty($value)) ? sanitize($value) : false;
    }
    function sanitize($data) {
        return htmlentities(strip_tags(mysql_znote_escape_string($data)));
    }
    
    function VerifyPaypalIPN(array $IPN = null){
        if(empty($IPN)){
            $IPN = $_POST;
        }
        if(empty($IPN['verify_sign'])){
            return null;
        }
        $IPN['cmd'] = '_notify-validate';
        $PaypalHost = (empty($IPN['test_ipn']) ? 'www' : 'www.sandbox').'.paypal.com';
        $cURL = curl_init();
        curl_setopt($cURL,CURLOPT_SSL_VERIFYPEER,1);
        curl_setopt($cURL,CURLOPT_SSL_VERIFYHOST,2);
        curl_setopt($cURL,CURLOPT_SSLVERSION,6);
        curl_setopt($cURL,CURLOPT_CAINFO,__DIR__ . '/cert/cacert.pem');
        curl_setopt($cURL,CURLOPT_URL,"https://{$PaypalHost}/cgi-bin/webscr");
        curl_setopt($cURL,CURLOPT_ENCODING,'gzip');
        curl_setopt($cURL,CURLOPT_BINARYTRANSFER,true);
        curl_setopt($cURL,CURLOPT_POST,true); // POST back
        curl_setopt($cURL,CURLOPT_POSTFIELDS,$IPN); // the $IPN
        curl_setopt($cURL,CURLOPT_HEADER,false);
        curl_setopt($cURL,CURLOPT_RETURNTRANSFER,CURLOPT_FORBID_REUSE,CURLOPT_FRESH_CONNECT,CURLOPT_CONNECTTIMEOUT,30);
        curl_setopt($cURL,CURLOPT_TIMEOUT,60);
        curl_setopt($cURL,CURLINFO_HEADER_OUT,CURLOPT_HTTPHEADER,array(
            'Connection: close','Expect: ',));
        $Response = curl_exec($cURL);
        $Status = (int)curl_getinfo($cURL,CURLINFO_HTTP_CODE);
    curl_close($cURL);
        if(empty($Response) or !preg_match('~^(VERIFIED|INVALID)$~i',$Response = trim($Response)) or !$Status){
            return null;
        }
        if(intval($Status / 100) != 2){
            return false;
        }
        return !strcasecmp($Response,'VERIFIED');
    }

    // Fetch paypal configurations
    $paypal = $config['paypal'];
    $prices = $config['paypal_prices'];
    
    // Send an empty HTTP 200 OK response to acknowledge receipt of the notification 
    header('HTTP/1.1 200 OK'); 

    // Build the required acknowledgement message out of the notification just received
    $req = 'cmd=_notify-validate';
    foreach ($_POST as $key => $value) {
        $value = urlencode(stripslashes($value));
        $req  .= "&$key=$value";
    }
    $postdata = $req;
    
    // Assign payment notification values to local variables
    $item_name        = $_POST['item_name'];
    $item_number      = $_POST['item_number'];
    $payment_status   = $_POST['payment_status'];
    $payment_amount   = $_POST['mc_gross'];
    $payment_currency = $_POST['mc_currency'];
    $txn_id           = getValue($_POST['txn_id']);
    $receiver_email   = getValue($_POST['receiver_email']);
    $payer_email      = getValue($_POST['payer_email']);
    $custom           = (int)$_POST['custom'];

    $connectedIp = $_SERVER['REMOTE_ADDR'];
    mysql_insert("INSERT INTO `paypal` VALUES ('0','$txn_id','Connection from IP: $connectedIp','0','0')");
    
    $status = VerifyPaypalIPN();
    if ($status) {
        // Check that the payment_status is Completed
        if ($payment_status == 'Completed') {

            
            // Check that txn_id has not been previously processed
            $txn_id_check = mysql_select_single("SELECT `txn_id` FROM `paypal` WHERE `txn_id`='$txn_id'");
            if ($txn_id_check !== false) {
                // Check that receiver_email is your Primary PayPal email
                if ($receiver_email == $paypal['email']) {
                    
                    $status = true;
                    $paidMoney = 0;
                    $paidPoints = 0;

                    foreach ($prices as $priceValue => $pointsValue) {
                        if ($priceValue == $payment_amount) {
                            $paidMoney = $priceValue;
                            $paidPoints = $pointsValue;
                        }
                    }

                    if ($paidMoney == 0) $status = false; // Wrong amount of money
                    if ($payment_currency != $paypal['currency']) $status = false; // Wrong currency
                    
                    // Verify that the user haven't messed around with POST data
                    if ($status) {
                        // transaction log
                        mysql_insert("INSERT INTO `paypal` VALUES ('0','$payer_email','$custom','".$paidMoney."','".$paidPoints."')");
                        
                        // Process payment
                        $data = mysql_select_single("SELECT `premium_points` AS `old_points` FROM `accounts` WHERE `id`='$custom';");

                        // Give points to user
                        $new_points = $data['old_points'] + $paidPoints;
                        mysql_update("UPDATE `accounts` SET `premium_points`='$new_points' WHERE `id`='$custom'");
                    }
                }  else {
                    $pmail = $paypal['email'];
                    mysql_insert("INSERT INTO `paypal` VALUES ('0','ERROR: Wrong mail. Received: $receiver_email,configured: $pmail','0')");
                }
            }
        }
    } else {
        // Something is wrong
        mysql_insert("INSERT INTO `paypal` VALUES ('0','ERROR: Invalid data. $postdata','0')");
    }
?>

解决方法

您可以在 https://www.paypal.com/cgi-bin/webscr?cmd=_display-ipns-history

查看您帐户的 IPN 历史记录

如果您收到了您期望的所有 IPN，那么您需要调试您的侦听器。添加日志记录以确定哪里出错了，例如无法回发以验证 IPN。记录所有内容以确定错误是什么。还要检查您的网络服务器日志。

有关 IPN 的文档位于：https://developer.paypal.com/docs/api-basics/notifications/ipn/