pizzahut: Already wrote a message to support, but in the meantime maybe someone else can answer this related question:
Is it possible that the GOG store has a bug which prevents me from using the store credit if the original price of the game exceeds the store credit?
- I have a store credit of 3,99 USD.
- Game is currently on sale for 1,39 Euro (which *should* be covered by the store credit - but I can't use it for some reason).
- Original price of the game is 5,49 Euro which would exceed the store credit - but I'm trying to buy the game on sale.
Your store credit is in USD - set prices to USD, us said store credit. :)