in-app purchase methods(mkstorekit? )
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I have an app at the appstore , and i would like to add it in-app purchase, a basic one ,in order to purchase more levels .

I know that the `apple sdk` is very hard to implement,
I know the `mkstorekit` is an easy one, but i cant find a guide from scratch to use it .

Whats the best way to do so, any other method ?any good tutorial ?

Thanks a lot. 