Technically, it's not astraweb that didn't like the gift card.. it's their payment processor. I'm guessing you just clicked the Buy Now button? that takes you to 2checkout.
They also use other payment processors though, if you used the special kleverig offer, you'll see at the bottom of the page it says: Dutch Users pay with iDeal here. You could try that, they also accept AMEX, ignore the part about dutch users, just change the country on the payment page :P
If you're doing one of the normal plans, the iDeal link will be on the left side of the page
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