I found this script from http://codeseekah.com/ which will enable you to set-up multiple PayPal IPN listeners. It allows you to filter the notifications which means that you can send to different listeners depending on conditions that you set (so useful!):
<?php
ini_set( 'max_execution_time', 0 ); // Do not abort with timeouts
ini_set( 'display_errors', 'Off' ); // Do not display any errors to anyone
$urls = array(); // The broadcast session queue
// List of IPN listener points ** ADJUST THESE TO POINT TO YOUR LISTENERS
$ipns = array(
'first' => 'http://www.yourwebsite1.co.uk//paypal/ipn.php',
'second' => 'http://www.yourwebsite2.co.uk//paypal/ipn.php',
'third' => 'http://www.yourwebsite3.co.uk//paypal/ipn.php'
);
// ** ADJUST THESE CONDITIONS TO FILTER
if($_POST['txn_type']!='cart') $urls []= $ipns['first']; // Choose this IPN URL if all conditions have been met
if(isset($_POST['auction_buyer_id'])) $urls []= $ipns['second']; // Choose this IPN URL if all conditions have been met
$urls []= $ipns['third']; // maybe this one is always sent to
// Broadcast
if ( !sizeof($urls) ) $urls = $ipns; // No URLs have been matched
$urls = array_unique( $urls ); // Unique, just in case
// Broadcast (excluding IPNs from the list according to filter is possible
foreach ( $urls as $url ) broadcast( $url );
header( 'HTTP/1.1 200 OK', true, 200 );
exit();
// Perform a simple cURL-powered proxy request to broadcast
function broadcast( $url ) {
// Format POST data accordingly
$data = array();
foreach ($_POST as $key => $value) $data []= urlencode($key).'='.urlencode($value);
$data = implode('&', $data);
// Log the broadcast
file_put_contents('_logs/'.time().'.'.reverse_lookup( $url ).'-'.rand(1,100), $data);
$ch = curl_init(); // Initialize
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_POST, count($data));
curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_exec($ch); // Execute HTTP request
curl_close($ch); // Close
}
function reverse_lookup( $url ) {
global $ipns;
foreach ( $ipns as $tag => $_url ) {
if ( $url == $_url ) return $tag;
}
return 'unknown';
}
?>
Just customise the parts you need to (with **s), save it in a file, for example called "multiple-paypal-ipn.php", then put it on one of your servers. Then in your PayPal IPN URL setting (in PayPal) put in the full URL where you have just placed it, e.g. http://www.yourwebsite/paypal/multiple-paypal-ipn.php
This saved me BIG time so hopefully will for others!_g