Dralel: I bought two games earlier today and when I went to pay for them using my Bank's debit card, it gave me an error "Something went wrong, your payment has been declined by your bank" yet the 2 games I bought were still added to my library.
Anybody else having the same error or have done in the past?
GOG's payment processor is in Cyprus, which is a location often used for online fraud. As such, a lot of bank's and credit card companies seeing new transactions occurring through a bank in Cyprus will halt the transaction for security purposes pre-emptively to prevent potential fraud. Some card companies may call you on the phone from their security department to determine if it was a legit purchase, while some may just cockblock it and leave you with question marks floating around your head wondering what just happened.
You could try calling your bank/card company to find out from their end. If they didn't block it, it could be security measures at GOG's payment processor also as they have some haywire anti-fraud crap going on there too.