Psyringe: Try Paypal. Open a Paypal account, try to charge it from your credit card (local transaction), then use ypur Paypal account to pay for games on GOG.
Graaargh: Is paypal as secure? I heard that it isn't that great.
Well, it's as secure as the password that you are using. In most cases, when a Paypal account gets compromised, it's because the account owner used the same password as on some other site, which got hacked, and of course the hackers will test whether any login/password combination that they obtained will work on Paypal, Amazon, and any other services where there might be money to steal.
But with regard to security, I believe Paypal actually adds to your money's safety, if you use it like a wallet. My Paypal account never has more money on it than I could stomach losing _if_ it gets compromised. I disabled Paypal's feature to debit my bank account in case of insufficient funds. And _if_ I buy something at a potentially shady site, I'd rather do so with Paypal than giving them my credit card details. Credit card details should by used sparingly on the net, imho. Especially when you don't know whether the other side is storing the data somewhere (hackers obtain lots of valid credit card details from sites that thought it would be a great idea to store their customers' payment details).
There are many things that one can criticize about Paypal, and I wouldn't call myself a "fan" either ... but it certainly has its uses.