There is a FAQ page in the Wiki.
As I understand it, there isn't one. I searched everywhere, but all the codes were old.
If you're trying to get donor codes try donating to Runey. As someone who has beaten the game, I can say Runey very much deserves it. Also, if you do so, don't be a dick and leak them.
Clarification: I mean do not be a dick, and therefore do not leak the codes.
