I got the following message when trying to check out with iDeal:

Your payment attempt was declined by your bank because they require your confirmation or additional information from you.

I've checked with my bank and they did not ask any additional information.
Please change the error message into something that that is the underlying issue.
Don't blame it on my bank.

Maybe this is GOG using an outdated API as normal.

Let me see if i can buy something with ideal

must be a -Dutch Terrorist or one of the rare victims of the new banking rules-

Just purchased Cronos through ideal....

kinda stupid how this went, here you are thinking during a trip home, 'should i buy a new game ?', and here we are

remember guys, always comply to real requests from your bank