Its tricky but the short answer is no, you cannot sell things to people by any other means then the in-app purchase api's. However, if someone were to purchase an item on say your website and the account that purchased the dlc pack logged into your game on the ouya and just so happened to have dlc unlocked, that is fine. It's basicly what amazon and barnes & noble do with their e-reader apps on the ipad/iphone.
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