u think there is a problem with your card ? sometimes when i buy stuff from the net , my visa etc will sometimes freeze my card because they belive maybe someone had stolen your card . if i buy something on the net from china , it shows that the card was used in china and instantly they freeze my card for fraud/safety purposes . But once i call them oe they call me to straighten it out , it goes through . However maybe they are just doing site maintenence . Did u try it a couple times? try again and see if it works now