Slide 9
Slide 9 text
ɹ2-1. Terms by Apple & Google
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Any credits or in-game currencies purchased via IAP must be
consumed within the app and may not expire, and you should make
sure you have a restore mechanism for any restorable in-app
purchases.
3.1.1 In-App Purchase
https://developer.apple.com/app-store/review/guidelines/