Paypal IPN

<?php

$request = "cmd=_notify-validate";
foreach ($_POST as $varname => $varvalue){
 $email .= "$varname: $varvalue\n";
 if(function_exists('get_magic_quotes_gpc') and get_magic_quotes_gpc()){
  $varvalue = urlencode(stripslashes($varvalue));
 }
 else {
  $value = urlencode($value);
 }
 $request .= "&$varname=$varvalue";
}
$ch = curl_init();
curl_setopt($ch,CURLOPT_URL,"https://www.paypal.com/cgi-bin/webscr");
curl_setopt($ch,CURLOPT_POST,true);
curl_setopt($ch,CURLOPT_POSTFIELDS,$request);
curl_setopt($ch,CURLOPT_FOLLOWLOCATION,false);
curl_setopt($ch,CURLOPT_RETURNTRANSFER,true);
$result = curl_exec($ch);
curl_close($ch);
switch($result){
 case "VERIFIED": //Payment went through all right,

  break;
 case "INVALID": // Invalid or fake payment.

  break;
 default:
  // any other case (such as no response, connection timeout...)
}

?>