Implementing ‘Restore Purchase’ Feature in Mobile Games
To implement a ‘Restore Purchase’ feature in your mobile game, you need to integrate a system that can retrieve previous purchases made by a user, ensuring they get back what they paid for even if they reinstall the game or switch devices. This functionality is crucial for maintaining user trust and satisfaction.
Step-by-Step Implementation
1. Utilize the Right APIs
Both iOS and Android provide specific APIs to handle in-app purchase restoration:
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- iOS (StoreKit): On iOS, use
restoreCompletedTransactionsmethod from StoreKit to restore purchases. Ensure your transaction flow can handle restored transactions and update the game state accordingly. - Android (Google Play Billing): On Android, the billing library automatically queries the user’s purchases from Google Play. Implement the queryPurchases method to check and restore purchases.
2. Handle Purchase Restoration Logic
Build logic within your game to recognize when a purchase is restored. This often involves checking transaction identifiers or specific SKUs:
- Maintain a list of purchased items with unique identifiers.
- Upon restoring, check against this list to avoid duplications and update the user’s account.
3. User Interface Elements
Provide an intuitive user interface so players know they can restore purchases:
- Add a ‘Restore Purchases’ button in the relevant section of your app, such as settings or store.
- Ensure the button triggers the restoration function seamlessly, providing feedback during the process (e.g., loading indicators, success messages).
4. Testing
Thoroughly test the restoration flow across multiple scenarios:
- Reinstalling the app.
- Switching between devices.
- Network interruptions during the process.
Best Practices
- Always verify purchase credentials and user identities to prevent fraudulent access.
- Document and guide users on how to utilize the recovery feature if they encounter issues.
- Consider logged errors or failed restoration attempts to refine your process over time.
By following these guidelines and using the respective platform APIs, you can effectively integrate a ‘Restore Purchase’ feature, enhancing user experience and trust.