Here is the complete IPN:
<?php
// PHP 4.1
$paypal_sandbox = false;
// read the post from PayPal system and add 'cmd'
$req = 'cmd=_notify-validate';
foreach ($_POST as $key => $value) {
$value = urlencode(stripslashes($value));
$req .= "&$key=$value";
}
// post back to PayPal system to validate
$header .= "POST /cgi-bin/webscr HTTP/1.1\r\n";
if ($paypal_sandbox)
$header .= "Host: www.sandbox.paypal.com\r\n";
$header .= "Content-Type: application/x-www-form-urlencoded\r\n";
$header .= "Content-Length: " . strlen($req) . "\r\n\r\n";
if ($paypal_sandbox)
$fp = fsockopen ('ssl://www.sandbox.paypal.com', 443, $errno, $errstr, 30);
else
$fp = fsockopen ('ssl://www.paypal.com', 443, $errno, $errstr, 30);
// 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 = $_POST['payer_email'];
if (!$fp) {
mail('<an email address>', 'ERROR CONNECTING', $errno.' '.$errstr);
// HTTP ERROR
} else {
fputs ($fp, $header . $req);
while (!feof($fp)) {
$res = fgets ($fp, 1024);
if (strcmp ($res, "VERIFIED") == 0) {
session_id($_POST['custom']);
session_start();
$data = file_get_contents('temp/data/'.$_POST['custom']);
mail('<an email address>', 'DATA', $data);
$_SESSION = unserialize($data);
include_once('config.php');
if(isset($_SESSION['uid']) && $_SESSION['uid'] != 0)
$order_number = orderpayment(1);
else
$order_number = orderpayment();
if (is_file('temp/data/'.$_POST['custom'])) {
//@unlink('temp/data/'.$_POST['custom']);
$_SESSION['order_number'] = $order_number;
// append the order number to the file
$h = fopen('temp/data/'.$_POST['custom'], 'w');
fwrite($h, serialize($_SESSION));
fclose($h);
}
} else if (strcmp ($res, "INVALID") == 0) {
// log for manual investigation
}
}
fclose ($fp);
}
?>
