[thaumasiotes]

Years ago I kept having Blizzard cancel my subscription to World of Warcraft because of unspecified problems with the payment information. I'd get locked out, I'd pay again, and a couple days later they'd be angry again over my invalid payment information.

I eventually learned that what they meant by "invalid" was "sure, your payment information is already associated with your account, but it doesn't match the preferred card listed on your account".