Status (by robm at Thu May 20 03:01 UTC)
It appears that worldpay (our credit card payment provider) was having some problems processing payments the other day. It appears that between the times 2010-05-18 20:10 and 2010-05-19 00:30 (US EDST) all payments failed with the error:
Incorrect authorisation password
The problem has been resolved, and all users that experienced this error should be able to try again now.