You need to understand how Moneybookers works.
1. Your payment form sends (a.k.a. POSTs) all of it's data to a Moneybookers script.2. Your user enters their credit card details to MoneyBookers.3. Moneybookers sends the verification data and an optional "merchant_fields" $_POST variable back to your "paychecker.php" script.
So you need to pass the information to Moneybookers and Moneybookers passes it back to you after the order has been verified.
Or, like I said before, see the Moneybookers Gateway Manual (specifically page 9).
By the way, you might be better off contacting Moneybookers support. This really has nothing to do with LimeLM or TurboActivate.