介绍
In-App Purchase is an Apple technology that allows your users to purchase content and services from within your app. You set up In-App Purchase products through iTunes Connect, a suite of web-based tools. You implement In-App Purchase in your app using the Store Kit framework.内置购买是一种苹果技术，它允许用户从你的应用内部购买内容和服务。
如何测试应用程序内置购买
In-App Purchase allows you to sell additional features and functionality from within your iOS and OS X applications. If you wish to offer In-App Purchase in your applications, you must complete several steps before you can do it. This document provides step-by-step instructions for setting up and testing In-App Purchase.
恢复购买记录
Users restore transactions to maintain access to content they’ve already purchased. For example, when they upgrade to a new phone, they don’t lose all of the items they purchased on the old phone. Include some mechanism in your app to let the user restore their purchases, such as a Restore Purchases button.
使用订阅
Apps that use subscriptions have some additional behaviors and considerations. Because subscriptions incorporate an element of time, your app needs to have the appropriate logic to determine whether the subscription is currently active and what time periods the subscription was active in the past.
创建和配置产品
A product is something you want to sell in your app’s store. You create and configure products in iTunes Connect, and your app interacts with products using the SKProduct and SKProductsRequest classes.产品是你想要在应用商店里出售的东西。 你在 iTunes Connect 里创建和配置产品，然后你的应用程序使用 SKProduct 和 SKProctsRequest 类跟产品交互。
内置购买
In-App Purchase allows you to embed a store inside your app using the Store Kit framework. This framework connects to the App Store on your app’s behalf to securely process payments from users, prompting them to authorize payment. The framework then notifies your app, which provides the purchased items to users.
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