wizisi2k: ANY GOG key from a third party website is a key brought with fraud and WILL be revoked. You are SOL unless you find a way to use paypal.
paladin181: Not entirely true. Many of the third party people bought the keys legitimately. You just have no way of knowing if they did or not.
Of course, there are a lot of examples (on Steam) with renowed resellers someones have a deal with Steam and other didn't but they are 100% legit (G2A is Scam paradise).
vsr: GOG accepts
Webmoney. Although, i don't know if it is available as GOG's payment option for Argentina.
I *think* you can add your bitcoins to your
WMX wallet (WMX - is the name for wallets for bitcoins, WMZ - for dollar wallets, WMR - for wallets in Russian Roubles, etc).
Webmoney has Exchange services, where you can safely trade your bitcoins for any currency you need (or, in this case, GOG accepts).
There is a
wiki in Russian on how to add your BTC to WMX wallet, a sort of a How-To.
Official wiki Sadly it's not possible, the payment method is via Credit Card or Bank Transfer. I think I could go to a trade web to trade (redundant) paypal usd and btc.