如何解决 Paypal 错误 - 您用于进入 PayPal 系统的链接无效。请查看链接并重试？

Posted 2023-02-22

【中文标题】如何解决 Paypal 错误 - 您用于进入 PayPal 系统的链接无效。请查看链接并重试？

【英文标题】：How to resolve Paypal Error - The link you have used to enter the PayPal system is invalid. Please review the link and try again?

【发布时间】：2016-03-09 04:19:23

【问题描述】：

我正在按照本教程中的说明进行操作：http://code.tutsplus.com/tutorials/using-paypals-instant-payment-notification-with-php--net-3271

我已经有一个帐户。这是一个个人 Paypal 帐户，但我想我可以使用它，否则将没有任何设置来打开或关闭 IPN 等。 我启用了 IPN 并将通知 URL 设置为domain.com/ipn.php

我还创建了一个 Paypal 按钮，代码如下：

<form action="https://www.sandbox.paypal.com/cgi-bin/webscr" method="post" target="_top">
  <input type="hidden" name="cmd" value="_s-xclick">
  <input type="hidden" name="hosted_button_id" value="3B85B5WNMDLUU">
  <input type="submit" name="submit" value="Paypal Sandbox">
</form>

我对 ipn.php 使用了以下代码

$req = 'cmd=_notify-validate';
foreach ($_POST as $key => $value) 
  $value = urlencode(stripslashes($value));
  $req .= "&$key=$value";


$header = "POST /cgi-bin/webscr HTTP/1.0\r\n";
$header .= "Content-Type: application/x-www-form-urlencoded\r\n";
$header .= "Content-Length: " . strlen($req) . "\r\n\r\n";

$fp = fsockopen ('www.sandbox.paypal.com', 80, $errno, $errstr, 30); 

if (!$fp)  
else 
  fputs ($fp, $header . $req);
  while (!feof($fp)) 
    $res = fgets ($fp, 1024);
    if (strcmp ($res, "VERIFIED") == 0) 

      // PAYMENT VALIDATED & VERIFIED!
      mail("Email Address", 'Payment Paypal', Used Email Address -    $_POST['payer_email'], 'Website');
    

点击支付按钮并登录后出现错误

   The link you have used to enter the PayPal system is invalid. Please review the link and try again.

脚本有错误吗？

【问题讨论】：

您能否告诉我托管按钮 ID 以及与您创建的按钮关联的沙盒电子邮件帐户，以便我查看更多信息？

@paypal_louis 我认为这是一个安全威胁：D。我现在将更新答案以包含它。

不是。一旦您将代码放入您的网站，该 ID 无论如何都可以公开访问。等待您的 hosts_button_id..

@paypal_louis 我已经添加了。我有一个问题。我是否还需要像验证我的实际 Paypal 帐户一样验证测试帐户。

不，你也不需要。但是您应该从 developer.paypal.com 创建沙盒帐户，它会立即得到验证。

【参考方案1】：

该错误可能是由于创建的按钮存在问题。转到 developer.paypal.com ，创建一个 Business Sandbox 帐户。

然后转到 www.sandbox.paypal.com 并使用您创建的帐户登录，然后从您的帐户创建一个按钮。

然后，复制并粘贴为您生成的整个代码，并将其粘贴到您的网页中。一旦您单击按钮并使用您的沙盒买家帐户登录以进行测试付款，一切都应该正常工作。

IPN 代码似乎未完成。请改用这个：

<?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);
    

?>

【讨论】：

有没有办法获取买家的用户名？

您将获得 IPN 中买家的 first_name、last_name ，更多 IPN 变量请访问：developer.paypal.com/docs/classic/ipn/integration-guide/…

我们可以在聊天室再谈一次吗？谢谢。

@SanJeetSingh，如果您还有其他问题/问题，请通过paypal.com/mts 向我们提交工单，我们会查看。