hi Katja i've got exactly the same problem. ie card type and expiry date and the 'declined' message been trying to get an order placed now for 10 days with no success at all. tried 3 browsers, spaces, nospaces, varied security settings and so on. even checked with CC co as to how they store data to see if the data format of something like the tel no was an issue did get responses from yvette first couple of emails but no response to last couple to her or the store. to be fair, some messages here from store did refer to mail server probs so may not have arrived do you live in the USA? i don't and wonder if that is part of cause. some Swiss chap posted a week or so ago wondering if his problems were caused by the sys assuming US data types in the field structures. as a for instance, the form says fill out all fields but i just don't have a second address line. i leave it blank, but if it expects something........? anyone else using mastercard had it work? and any of you from ex USA? anyone from ex USA get anything to work? alan