Posted By

xtheonex on 02/06/09

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Last Edited at 02/06/09 08:23pm

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PayPal IPN Shell

/ Published in: PHP

This is a basic shell for PayPal IPN.
It is by no means a complete solution, but it should provide a good starting point for anyone that wants to work out IPN.
Or it can be used as is to do basic IPN.

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<?php
$req = 'cmd=_notify-validate';
foreach ($_POST as $key => $value) {
	$value = urlencode(stripslashes($value));
	$req .= "&$key=$value";
}
$header .= "POST /cgi-bin/webscr HTTP/1.0
";
$header .= "Host: www.paypal.com:80
";
// $header .= "Host: www.sandbox.paypal.com:80
";
$header .= "Content-Type: application/x-www-form-urlencoded
";
$header .= "Content-Length: " . strlen($req) . "

";
$fp = fsockopen ('www.paypal.com', 80, $errno, $errstr, 30);
// $fp = fsockopen ('www.sandbox.paypal.com', 80, $errno, $errstr, 30);
if (!$fp) {
	// Do some code when your server cannot communicate with PayPal!
	mail('email@yourhost.com', 'IPN ERROR', "HTTP ERROR\n\n" . $res);
} else {
	fputs ($fp, $header . $req);
	while (!feof($fp)) {
		$res = fgets ($fp, 1024);
			if (strcmp ($res, "VERIFIED") == 0) {
				if ($_POST['payment_status'] == 'Completed') {
					// Do some code when PayPal returns payment completed status!
					foreach ($_POST as $key => $value){
						$emailtext .= $key . ": " . $value . "\n";
					}
					mail('email@yourdomain.com', "IPN VARIABLES", $emailtext . "\n\nREQUEST STRING:\n" . $req);
				} else {
					// Do some code when PayPal returns a different status!
					foreach ($_POST as $key => $value) {
						$emailtext .= $key . ": " . $value . "\n";
				}
				mail('email@yourdomain.com', "IPN VARIABLES", $emailtext . "\n\nREQUEST STRING:\n" . $req);
			}
		} elseif (strcmp ($res, "INVALID") == 0) {
			// Do some code when PayPal returns some error!
			foreach ($_POST as $key => $value){
				$emailtext .= $key . ": " . $value . "\n";
			}
			mail('email@yourdomain.com', "IPN VARIABLES", $emailtext . "\n\nREQUEST STRING:\n" . $req);
		}
	}
fclose ($fp);
}
?>

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