amember to a new domain, paypal ipn problems, losing lot of money, please help ASAP

Hi,

I have shifted my amember to a new domain , for old recurring paypal payments, i used the following code for old amember ipn as told by support team.

<?php
$url = "http://www.your_domain_name.com/amember/plugins/paynment/paypal_r/ipn.php"; //adjust an URL here
$vars = ($_SERVER['REQUEST_METHOD'] == 'POST') ? $_POST : $_GET;
$vars1 = array();
foreach ($vars as $kk=>$vv){
$v = urlencode($vv);
$k = urlencode($kk);
$vars1[] = "$k=$v";
}
$vars1 = join('&', $vars1);
$response = implode('', file($url . "?" . $vars1));
?>



Now this is not working , in the access logs , it says:

/amember/plugins/payment/paypal_r/ipn.php?test_ipn=1&paym...
paypal_r ERROR: IPN validation error: Paypal claims it is not-valid IPN transaction: [INVALID]



I really need your help here ASAP..
I am losing a lot money already due to this.


Thanks.