And for some clarity, this is the error message:
" SOMETHING WENT WRONG
AndersEnge, Your payment attempt was declined by your bank because they require your confirmation, or additional information from you.
WHAT SHOULD I DO NOW?
Contact your bank's customer service center and confirm that you wish to make a transaction with "www.gog.com" or "GOG Limited". Afterwards, please try using your card again.
Use a different payment source, if possible, like a different card, or PayPal.
WHY WAS MY PAYMENT ATTEMPT RESTRICTED, AND WHAT CAN I DO NOW?
Your bank might automatically reject all international/overseas transactions (we're based in Europe), unless they get your personal approval.
You might have exceeded the daily/weekly limit of online payments with your card.
In both cases, you need to contact your bank's customer service center, if you wish to use this card on our site."
I've never had this issue before, neither on GOG nor any other site/shop, and I've also checked with the bank (online) and there shouldn't be an issue. (The last time I made a purchase on GOG was for Gwent Thronebreaker, about 1 & a half month ago.)