Paypal缺失POST数据求助：使用官方IPN文件遇异常

Hey there, let's work through this "Paypal Missing POST Data" issue together. Since you're using PayPal's official scripts, the problem is unlikely to be with the code itself—but we can tweak the files to work around potential server POST restrictions and verify what's going on.

First, Verify if Your Server is Actually Blocking POST Data #

Before modifying anything, let's confirm whether the server is receiving POST data at all. Add this temporary debug code at the very top of either ZZZ.php or PAYPALIPN.php:

// Temporary debug log to check POST data
file_put_contents('paypal_post_debug.log', print_r($_POST, true) . "\n---\n", FILE_APPEND);

Then, either simulate a PayPal IPN request using a tool like Postman (send a POST to your script URL with dummy IPN parameters) or wait for a real IPN trigger. Check the paypal_post_debug.log file—if it's empty, your server is indeed blocking or dropping POST data.

Modify the IPN Class to Bypass $_POST (Use Raw Input) #

Sometimes PHP's $_POST superglobal can fail due to server configs (like small post_max_size, disabled enable_post_data_reading, or security filters). Instead, read the raw POST input directly. Update the PaypalIPN class's validation logic to use this method:

Find the part of the class where it retrieves POST data (usually in the method that sends the verification request back to PayPal) and replace it with:

// Get raw POST data instead of relying on $_POST
$raw_post_data = file_get_contents('php://input');
$raw_post_array = explode('&', $raw_post_data);
$verified_post_data = [];

foreach ($raw_post_array as $key_value_pair) {
    $pair = explode('=', $key_value_pair);
    if (count($pair) === 2) {
        // Decode URL-encoded values properly
        $verified_post_data[urldecode($pair[0])] = urldecode($pair[1]);
    }
}

// Use $verified_post_data instead of $_POST for all subsequent IPN checks

This bypasses any server-side filtering that might be breaking $_POST and grabs the raw request data directly.

Tweak PHP Configs via Script (If Allowed) #

Some servers let you adjust PHP settings directly in your script. Add these lines at the top of your main IPN handler file (ZZZ.php or the file that calls the PaypalIPN class) to ensure POST data can be processed:

// Adjust PHP settings to support larger POST payloads
ini_set('post_max_size', '10M');
ini_set('max_input_vars', 1500);
ini_set('enable_post_data_reading', 'On');

Note: Not all servers allow modifying these settings via ini_set—if this doesn't work, you'll need to check your server's php.ini file or contact your host.

Check for Server-Side Blockers #

If the above tweaks don't work, the issue might be a server firewall, security plugin (like ModSecurity), or hosting provider rules that block PayPal's IP addresses or POST requests from external services. You can:

• Check your server's firewall logs for blocked requests from PayPal's IP ranges
• Ask your hosting provider if they have any restrictions on incoming POST requests from external payment gateways

内容的提问来源于stack exchange，提问作者juanma