Sample Postback

$secret_password = 'ENTER YOUR SECRET PASSWORD HERE';
$password = $_REQUEST['pwd'];
$credit = $_REQUEST['c'];
$user = trim($_REQUEST['u']);
$type = trim($_REQUEST['t']);
$status = trim($_REQUEST['s']);
$transaction_id = trim($_REQUEST['transaction_id']);
$publisher_payout = trim($_REQUEST['payout']);
if( $password === $secret_password )
{
    if($status === 1)
    {
		if($type === 1)
		{
			//Credit Cash to user
			//Update on Database
		}
		else
		{
			//Credit Point to user
			//Update on Database
    		}
		exit("OK");
   }
   else
   {
		if($type === 1)
		{
			//Debit Cash
			//Update on Database
		}
		else
		{
			//Debit Point
			//Update on Database
		}
		exit("OK");
   }
}
die("Failed");