Sorry all, the shop is currently not applying purchases successfully after processing credit card payments, so we have temporarily disabled the ability to pay with a credit card. It should come back up as soon as someone who can fix things is awake to diagnose the issue. In the meantime, you should still be able to make purchases with points.

Update 11:24 EDT: You should be able to pay with cards again! If you have a payment that hasn't been applied yet, wait 15 minutes...