If anyone is still having issues with this, I solved it... In order to pay you need the payment to be processed in Canada or the US, but gog uses a uk cc processor, and paypal.uk, which does as well. You need to add funds to your paypal account, but, you can't use a credit card, only a bank account. However, if you receive money from another paypal account, you get it as a paypal balance, and you can send money via credit card using paypal.com or paypal.ca, which you can do with a paypower card, and most pre-paid cards. You need to open a second paypal account, all you need is a second email address. You can use the same name, address, credit card, everything but the email address, then send yourself the amount you need. Then go back to gog, pay via paypal, choose to pay with your balance, and it'll work. You end up paying a small fee for sending money via credit card, it was under a dollar for me on a 13$ purchase, not sure what % it is, or how it's calculated, but, it does not seem to be too big, and it'll let you pay for gog games with a paypower card.