how can I add in-app purchase to my app

To add in-app purchases to your app, you can follow the guidelines and updates presented in the sessions from WWDC 2024. Here are the key steps and resources:

1. Use StoreKit 2: StoreKit 2 provides a suite of tools to handle in-app purchases efficiently. It supports the Swift Async/Await pattern for tasks like fetching product metadata, purchasing, and retrieving transaction history. StoreKit 2 also allows you to access new App Store features even on older operating systems thanks to the back-deployed attribute in Swift. For more details, you can refer to the What’s new in StoreKit and In-App Purchase session.

2. Merchandise Using SwiftUI: You can create custom UI for your in-app purchases using SwiftUI. This includes setting up a StoreKit configuration file with your product metadata, which is necessary for getting the in-app purchase UI working with Xcode previews. For more information, see the Merchandise using SwiftUI chapter.

3. Testing in Xcode: The transaction manager in Xcode is essential for testing and debugging your in-app purchases. You can simulate purchase intents, test billing issue messages, and handle incoming purchase intents. For a detailed explanation, check out the Test in Xcode chapter.

4. Implement Purchase Intents: Purchase intents are used when a customer begins a purchase outside of your app, such as a promoted in-app purchase or a win-back offer. You can handle these intents by either continuing the purchase immediately or storing the intent for later use. For more details, refer to the Implement App Store Offers session.

5. Configure Win-Back Offers: You can configure win-back offers in App Store Connect and test them using Xcode. This involves setting up eligibility rules and using the purchase intent API to handle purchases initiated on the App Store. For more information, see the Configure win-back offers chapter.

For a comprehensive guide, you can watch the full sessions:

• What’s new in StoreKit and In-App Purchase
• Implement App Store Offers

These sessions will provide you with detailed steps and examples to integrate in-app purchases into your app effectively.