In App Purchase open source implementations?

I'm looking in open source implementations on top of the In App Purchase, maybe with the server-side implementation.

I know about h开发者_C百科ttp://urbanairship.com, but I prefer do it in-house.

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Have a look on MKStoreKit - small StoreKit wrapper. It gives some abstraction about what goes inside SK. However, you'll need to change it a bit to fit your needs

Hope this will help you