Hopefully this helps others out that aren't experts on this stuff, I am certainly not. Basically the issue is that PayPal does not let you change the IPN url on existing subscriptions. So those guys I didn't want to lose when I migrated from vBulletin to Xenforo. The solution that I finally had found was to use this code that codeseekah.com had written here: https://codeseekah.com/2012/02/11/how-to-setup-multiple-ipn-receivers-in-paypal/ This code is self explanatory. Now this only applies to vBulletin users but it can work for others too the same way, but what you need to do is edit your payment_gateway.php file in your vBulletin root to get it to include this code however you want to do it. You can create the ipnredirect.php and include the file at the top of payment_gateway.php or you can do like me and just replace all of the code in there. Enjoy. REDIRECT CODE: Code: <?php /* * This is a PayPal IPN (Instant Payment Notification) broadcaster * Since PayPal does not provide any straightforward way to add * multiple IPN listeners we'll have to create a central IPN * listener that will broadcast (or filter and dispatch) Instant * Payment Notifications to different destinations (IPN listeners) * * Destination IPN listeners must not panic and recognize IPNs sent * by this central broadcast as valid ones in terms of source IP * and any other fingerprints. Any IP filtering must add this host, * other adjustments made as necessary. * * IPNs are logged into files for debugging and maintenance purposes * * this code comes with absolutely no warranty * https://codeseekah.com */ 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 */ $ipns = array( 'mystore' => 'http://mystore.com/ipn.php', 'myotherstore' => 'http://mybigstore.com/paypal_ipn.php', 'myotherandbetterstore' => 'http://slickstore.com/paypal/ipn.php' ); /* Fingerprints */ if ( /* My Store IPN Fingerprint */ preg_match( '#^\d+\|[a-f0-9]{32}$#', $_POST['custom'] ) /* Custom hash */ and $_POST['num_cart_items'] == 2 /* alwayst 1 item in cart */ and strpos( $_POST['item_name1'], 'MySite.com Product' ) == 0 /* First item name */ ) $urls []= $ipns['mystore']; /* Choose this IPN URL if all conditions have been met */ if ( /* My Other Store IPN Fingerprint */ sizeof( explode('_', $_POST['custom']) ) == 7 /* has 7 custom pieces */ ) $urls []= $ipns['myotherstore']; /* Choose this IPN URL if all conditions have been met */ /* My Other And Better Store IPN Fingerprint */ $custom = explode('|', $_POST['custom']); if ( isset($custom[2]) and $custom[2] == 'FROM_OB_STORE' /* custom prefixes */ ) $urls []= $ipns['myotherandbetterstore']; /* Choose this IPN URL if all conditions have been met */ /* ... */ /* Broadcast */ if ( !sizeof($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(); /* Thank you, bye */ /* 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'; } ?>