Offer users additional content and services through purchases they make within your app.
In-App Purchase allows you to offer for purchase products that are used within your app, and collect payment for the additional features and content. The StoreKit 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 delivers the purchased products to users.
To make products available for In-App Purchase, you first configure them in iTunes Connect (see Workflow for configuring in-app purchases). Users can purchase a product either within your app, or directly from the App Store if you choose to promote the product.