How can I implement in-app purchases

To implement in-app purchases in your app, you should use the StoreKit framework. Here are the key steps and some useful information from the WWDC sessions:

Use StoreKit 2: Starting with iOS 18, the original API for in-app purchases is deprecated. StoreKit 2 offers many improvements, such as automatic cryptographic validation and modern language features like the Swift Async/Await pattern. It also provides access to new App Store features even on older operating systems. For more details, refer to the What’s new in StoreKit and In-App Purchase session.
Testing in Xcode: You can test your in-app purchase flows using StoreKit testing in Xcode. This includes testing purchase intents and billing issue messages directly in your app. For more information, see the What’s new in StoreKit and In-App Purchase session.
Handling Purchase Intents: The purchase intent API allows you to handle purchases initiated outside your app, such as promoted in-app purchases or win-back offers. You can either continue the purchase immediately or store the intent for later use. For more details, check out the Implement App Store Offers session.
Server-Side Integration: Use the App Store server APIs to handle transactions and deliver content. This includes sending new and updated transactions from the device to your server and enabling App Store server notifications. For more information, refer to the Explore App Store server APIs for In-App Purchase session.
Merchandising: Use SwiftUI to create custom UI for handling incoming purchase intents and merchandising products. If you do nothing, the payment sheet will present itself once your app launches. For more details, see the What’s new in StoreKit and In-App Purchase session.

Relevant Sessions

These sessions provide comprehensive guidance on implementing and testing in-app purchases using the latest StoreKit features.