buying a @UXLondon ticket http://2011.uxlondon.com/register fighting Google Checkout bad failure #UX. #irony. Hyperlinked text on the "Your VISA card ... was declined." error page: "Retry your credit card or add a new one" only takes you to a page to add a new card or edit a current card - there is no actual "Retry" button for a transaction, nor any other indication of when if ever they will retry for you. Editing your card (e.g. re-entering the CVC) just takes you back to the same error page saying card "was declined" without actually attempting to re-authorize (have called my credit card company and confirmed that Google Checkout only tried authorizing once). Google Checkout has dropped the ball on explaining what it is doing, what will happen next, and what if anything *I* should do next (editing your card just takes you back to the same error page with no actions taken on their behalf, no change in state, even after several tries = their bug).