how about cashu? you let the user store sats in any mint they choose, you allow them to make an in-app purchase to buy x sats which then are minted on the user's mint when you receive the payment from apple, and you store the proofs on the app
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This
That's what Apple wants. Then they get their 30% "share" and you pay the extra apple-prenium for your sats.
cashu could make sense for the ingame currency, but i could also just use tigerbeetle and anonymous identifiers which would be more reliable