Handling In-App Purchase Interactions and Receipt Validation [Part 4]
Completing the purchase cycle: User interactions and security through receipt validation
Welcome back to our In-App Purchase tutorial series!
In this blog, we’ll dive into the exciting part of the process: handling user interactions with displayed products, initiating purchases, and validating App Store receipts.
Let’s jump right in!
Handling User Interactions and Initiating Purchases
Now that you’ve fetched and displayed your In-App Purchase products, it’s time to let users make purchases. Let’s start by initiating purchases and handling user interactions using your ViewModel.
- Initiating Purchases: Inside your
IAPViewModel, implement a method to initiate the purchase process for a specific product.
2. Updating UI on Purchase: In your view controller, implement the delegate method buySelectedProduct(at:) to initiate the purchase when the user taps the “Buy Now” button.
3. Observing Payment Queue: To stay updated on the status of transactions, you need to observe the payment queue. Implement the necessary methods to observe the payment queue’s changes.
4. Updating ViewModel: Implement the handlePurchaseSuccess(_:), handlePurchaseFailure(_:), and handleRestoredPurchase(_:) methods in your IAPViewModel to process the transaction results and update your UI accordingly.
Validating App Store Receipts
It’s crucial to validate App Store receipts to ensure the authenticity of purchases and prevent fraudulent activities. Here’s how you can handle receipt validation:
- Fetching Receipt Data: In your
IAPViewModel, implement a method to fetch the App Store receipt data.
2. Receipt Validation: Create a function that validates the receipt data with Apple’s servers. You’ll need to make a network request to Apple’s server to validate the receipt.
3. Implementing Receipt Validation: In your view controller, fetch the receipt data and then validate it using your ViewModel’s validateReceipt(with:completion:) method.
Conclusion
Congratulations!
You’ve learned how to handle user interactions with In-App Purchase products, initiate purchases, and validate App Store receipts.
With these techniques in your toolbox, you’re well-equipped to create a seamless and secure purchasing experience for your app users.
In the next blog, we’ll wrap up this series by discussing additional best practices, tips for testing in-app purchases, and common pitfalls to avoid.
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