Like any payment platform, they have their somewhat byzantine and always opaque rules about who they'll work with. Do what you can to get it to work, it's easier to get bugfixes on the early releases that way. But if you can't, and you don't mind the hassle, buy the game here (same price as a sub, $10), drop me a note over on FA (bitshift) with the email on your purchase so I can check, and I'll toss you a link.