Alertpay IPN problems

I've set up alertpay, using there guide, and there example script with a few mods...

The page with the payment button.

<form method="post" action="https://www.alertpay.com/PayProcess.aspx" >
<input type="hidden" name="ap_purchasetype" value="item"/>
<input type="hidden" name="ap_merchant" value="alertpay@xxx.com"/>
<input type="hidden" name="ap_itemname" value="Testing"/>
<input type="hidden" name="ap_description" value="Testing"/>
<input type="hidden" name="ap_currency" value="USD"/>
<input type="hidden" name="ap_returnurl" value="http://www.xxx.com/thankyou.php"/>
<input type="hidden" name="ap_itemcode" value="<? echo $_SESSION["username"]; ?>"/>
<input type="hidden" name="ap_quantity" value="1"/>
<input type="hidden" name="ap_amount" value="10"/>
<input type="image" name="ap_image" src="https://www.alertpay.com/Images/BuyNow/big_pay_01.gif"/>
</form>

PHP:

The ipn.php file, which is where the data should be getting sent too

<?
require("ipndata.php"); // imports security code
$ap_sec_code = $_POST['ap_securitycode'];
if (strcmp($security_code, $ap_sec_code) == 0){
  if($_POST["ap_itemname"] == "Testing") {
    $username=$_POST["ap_itemcode"];
    $query=mysql_query("INSERT INTO upgraded VALUES (NULL, '{$_SESSION["username"]}', curdate())");
  }
}
?>

PHP:

And then just the thankyou.php has a thanks message.

But when i run a test payment (in test mode) the upgraded table still remain blank... any help or ideas?

 

First check this by using mail() instead of mysql_query() function if it works then double check your query.