3.1.1 In-App Purchase:
If you want to unlock features or functionality within your app, (by way of example: subscriptions, in-game currencies, game levels, access to premium content, or unlocking a full version), you must use in-app purchase. Apps may not include buttons, external links, or other calls to action that direct customers to purchasing mechanisms other than IAP.
如果你想在你的app中解锁新特性或者新功能，（举例：订阅,游戏内货币,游戏水平,获取优质内容,或解锁完整版），你必须使用内购。app不能包括其他的按钮，外部链接，或者调用动作，来替代内购
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.
任何积分或游戏内货币购买通过IAP必须在应用程序,不得使用过期,你应该确保你有任何恢复原状的应用内购买的恢复机制
Remember to assign the correct purchasability type or your app will be rejected.
记住分配正确的purchasability类型或应用程序将会被拒绝
Apps should not directly or indirectly enable gifting of IAP content, features, or consumable items to others.
应用程序不应直接或间接地使赠送IAP的内容,特点,或可消费的物品
Apps distributed via the Mac App Store may host plug-ins or extensions that are enabled with mechanisms other than the App Store.
通过Mac App Store应用分布式可能启用主机插件或扩展机制以外的应用程序商店。