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アップルが作成した契約書の中身から抜粋。

1. Use of the In App Purchase API
1.1 You may use the In App Purchase API only to enable end users to purchase content, functionality, or services that You make available for use within Your Application (e.g. digital books, additional game levels, access to a turn-by-turn map service). You may not use the In App Purchase API to offer goods or services to be used outside of Your Application.

2.1 You may not use the In App Purchase API to enable an end user to set up a pre-paid account to be used for subsequent purchases of content, functionality, or services, or otherwise create balances or credits that end users can redeem or use to make purchases at a later time.
2.2 You may not enable end users to purchase Currency of any kind through the In App Purchase API, including but not limited to any Currency for exchange, gifting, redemption, transfer, trading or use in purchasing or obtaining anything within or outside of Your Application. “Currency” means any form of currency, points, credits, resources, content or other items or units recognized by a group of individuals or entities as representing a particular value and that can be transferred or circulated as a medium of exchange.

2.6 With the exception of items of content that an end user consumes or uses up within Your Application (e.g. poker chips or virtual supplies such as construction materials) (a “Consumable”), any other content, functionality, services or subscriptions purchased through the use of the In App Purchase API must be made available to end users in accordance with the same usage rules as Licensed Applications (e.g. any such content, services or functionality must be available to all of the devices associated with an end user’s account). You will be responsible for identifying Consumable items to Apple and for disclosing to end users that Consumables will not be available for use on other devices.

2.1 You agree not to harm or interfere with Apple’s networks or servers, or any third party servers or networks connected to the Game Center service, or otherwise disrupt other developers' or end users’ use of the Game Center. You agree that, except for testing and development purposes, You will not create false accounts through the use of the Game Center service or otherwise use the Game Center service to misrepresent information about You or Your Application in a way that would interfere with an end users’ use of the Game Center service, e.g., creating inflated high scores through the use of cheat codes or falsifying the number of user accounts for Your Application.