如何在会员网站上使用贝宝 IPN (PHP)

Posted 2023-02-22

【中文标题】如何在会员网站上使用贝宝 IPN (PHP)

【英文标题】：How to use paypal IPN for membership website ( PHP )

【发布时间】：2015-12-14 09:22:21

【问题描述】：

使用 PayPal 按钮为我的网站订阅服务进行定期付款。我使用电子邮件和密码创建了一个登录系统。登录后，用户可以支付订阅费用（出现一个 PayPal 按钮）一旦他们支付了订阅费用，他们就会被重定向到我的 ipn 页面，在这里我想以某种方式更新我的数据库中的用户 members_status = 1，如果用户取消他们的付款我想要它，因此 IPN 将向服务器发送消息并设置 members_status = 0 例如。我不确定执行此操作的最安全方法。

这是paypal为IPN页面提供的php代码

<?php

// CONFIG: Enable debug mode. This means we'll log requests into 'ipn.log' in the same directory.
// Especially useful if you encounter network errors or other intermittent problems with IPN (validation).
// Set this to 0 once you go live or don't require logging.
define("DEBUG", 1);

// Set to 0 once you're ready to go live
define("USE_SANDBOX", 1);


define("LOG_FILE", "./ipn.log");


// Read POST data
// reading posted data directly from $_POST causes serialization
// issues with array data in POST. Reading raw POST data from input stream instead.
$raw_post_data = file_get_contents('php://input');
$raw_post_array = explode('&', $raw_post_data);
$myPost = array();
foreach ($raw_post_array as $keyval) 
    $keyval = explode ('=', $keyval);
    if (count($keyval) == 2)
        $myPost[$keyval[0]] = urldecode($keyval[1]);

// read the post from PayPal system and add 'cmd'
$req = 'cmd=_notify-validate';
if(function_exists('get_magic_quotes_gpc')) 
    $get_magic_quotes_exists = true;

foreach ($myPost as $key => $value) 
    if($get_magic_quotes_exists == true && get_magic_quotes_gpc() == 1) 
        $value = urlencode(stripslashes($value));
     else 
        $value = urlencode($value);
    
    $req .= "&$key=$value";


// Post IPN data back to PayPal to validate the IPN data is genuine
// Without this step anyone can fake IPN data

if(USE_SANDBOX == true) 
    $paypal_url = "https://www.sandbox.paypal.com/cgi-bin/webscr";
 else 
    $paypal_url = "https://www.paypal.com/cgi-bin/webscr";


$ch = curl_init($paypal_url);
if ($ch == FALSE) 
    return FALSE;


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);

if(DEBUG == true) 
    curl_setopt($ch, CURLOPT_HEADER, 1);
    curl_setopt($ch, CURLINFO_HEADER_OUT, 1);


// CONFIG: Optional proxy configuration
//curl_setopt($ch, CURLOPT_PROXY, $proxy);
//curl_setopt($ch, CURLOPT_HTTPPROXYTUNNEL, 1);

// Set TCP timeout to 30 seconds
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 30);
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Connection: Close'));

// CONFIG: Please download 'cacert.pem' from "http://curl.haxx.se/docs/caextract.html" and set the directory path
// of the certificate as shown below. Ensure the file is readable by the webserver.
// This is mandatory for some environments.

//$cert = __DIR__ . "./cacert.pem";
//curl_setopt($ch, CURLOPT_CAINFO, $cert);

$res = curl_exec($ch);
if (curl_errno($ch) != 0) // cURL error
    
    if(DEBUG == true)  
        error_log(date('[Y-m-d H:i e] '). "Can't connect to PayPal to validate IPN message: " . curl_error($ch) . PHP_EOL, 3, LOG_FILE);
    
    curl_close($ch);
    exit;

 else 
        // Log the entire HTTP response if debug is switched on.
        if(DEBUG == true) 
            error_log(date('[Y-m-d H:i e] '). "HTTP request of validation request:". curl_getinfo($ch, CURLINFO_HEADER_OUT) ." for IPN payload: $req" . PHP_EOL, 3, LOG_FILE);
            error_log(date('[Y-m-d H:i e] '). "HTTP response of validation request: $res" . PHP_EOL, 3, LOG_FILE);
        
        curl_close($ch);


// Inspect IPN validation result and act accordingly

// Split response headers and payload, a better way for strcmp
$tokens = explode("\r\n\r\n", trim($res));
$res = trim(end($tokens));

if (strcmp ($res, "VERIFIED") == 0) 
    // check whether the payment_status is Completed
    // check that txn_id has not been previously processed
    // check that receiver_email is your PayPal email
    // check that payment_amount/payment_currency are correct
    // process payment and mark item as paid.

    // assign posted variables 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 = $_POST['txn_id'];
    //$receiver_email = $_POST['receiver_email'];
    //$payer_email = $_POST['payer_email'];

    if(DEBUG == true) 
        error_log(date('[Y-m-d H:i e] '). "Verified IPN: $req ". PHP_EOL, 3, LOG_FILE);
    
 else if (strcmp ($res, "INVALID") == 0) 
    // log for manual investigation
    // Add business logic here which deals with invalid IPN messages
    if(DEBUG == true) 
        error_log(date('[Y-m-d H:i e] '). "Invalid IPN: $req" . PHP_EOL, 3, LOG_FILE);
    


?>

【参考方案1】：

一旦他们支付了订阅费用，他们就会被重定向到我的 ipn 页面

非常糟糕的选择，将用户重定向到 IPN 页面，使用自动返回 URL 将客户从 Paypal 带回您的网站。 More Information

这里我想更新数据库中的用户 members_status = 1

即时付款通知 (IPN) 是一种消息服务，可自动通知商家与 PayPal 交易相关的事件。商家可以使用它来自动化后台和管理功能，例如自动履行订单和为客户提供订单状态。

More Info

您可以根据您在 IPN 中从 paypal 收到的付款状态更新数据库中的用户 members_status，付款状态例如 Completed, Pending, etc

如果用户取消了他们的付款，我想要它，所以 IPN 将向服务器发送消息并设置 members_status = 0

如果用户取消付款，请使用Cancel URL more information 将客户带回网站，但如果用户取消，Paypal 上没有付款活动，因此您不会通过 IPN 收到任何回复

但是当您使用recurring payments 时，只有在您的订阅会员取消现有会员资格的情况下，您才能通过 IPN 收到付款通知。

More information

【讨论】：

但是一旦用户进行了购买，他们应该被重定向到返回URL并且应该执行IPN脚本吗？我如何同时做这些？另外，您在考虑取消过程时误解了我的意思，我的意思是假设用户已经购买，但一周左右后他们决定取消订阅？在这种情况下如何实现 IPN 等。感谢您的回复

一旦用户在贝宝上进行了任何活动，IPN 脚本就会自动执行，您不需要在 IPN 页面上将用户带回并且关于取消，我更新了答案

感谢您的帮助，只需要找到实现它的最佳方法，以及我应该使用哪些 IPN 变量