Merge pull request #465 from Cecile-Lebleu/main

Create 10142: Explore testing in-app purchases

content/notes/wwdc23/10142.md

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+---
+contributors: Cecile-Lebleu
+---
+
+Speaker: Hemant Sawle, Commerce Developer Advocate 
+
+## StoreKit Testing in Xcode
+
+StoreKit Testing in Xcode allows local testing. Added in WWDC20.
+
+- StoreKit configuration file to create and manage IAPs.
+- Perform local testing of in app purchases
+- Use simulator or device to test.
+- Leverage StoreKitTest framework to automate testing IAPs.
+- Sync products from AppStore Connect to Xcode: so configuration file doesn’t need to be created manually.
+- Supports advance subscription use cases, like offer code redemption, price increase sheet, and subscriptions entering and exiting billing retry.
+- Flexible subscription renewal rate, from real-time to every 2 seconds.
+
+**New in Xcode 15:**
+
+- Static renewal rates, independent of subscription duration.
+- Simulate StoreKit errors to build better error handling.
+- If running multiple instances of your app, the transaction manager will display transactions for each app instance.
+- Transactions manager also allows buying IAPs directly, to test external transactions.
+
+Learn more in the session *“What’s new in StoreKit 2 and StoreKit Testing in Xcode”* from WWDC23
+
+## App Store Sandbox
+
+App Store Sandbox allows testing products set up in App Store Connect on client and server.
+
+Prerequisites:
+
+- Accept Paid Applications agreement
+- Registered device with your developer account
+- Create Sandbox Apple ID to make purchases in App Store Connect > Users & Access
+- Enable developer mode on device, in Privacy Settings
+
+Sandbox enables testing production-like scenarios like purchases, restores, and subscription offers. Distribute the app directly to the device from Xcode, or using a distribution method like Release Testing, Debugging, or Custom (to generate an IPA file).
+
+### Billing Problem message simulation (new)
+
+- Available in sandbox, it will be available for customers in production when they enter billing retry.
+- Uses StoreKit 2 message API with reason `billingIssue`.
+- Implement a message listener in views to defer or suppress the message
+- Simulate `billingIssue` message in sandbox to test how your app handles the message presentation.
+- To trigger this, the sandbox Apple ID needs to be subscribed to an auto-renewable subscription. In the device, go to App Store Settings > Account Settings and disable "Allow Purchases & Renewals". Then, go back to your app and the billing issue message will appear.
+
+Learn more about implementing StoreKit 2 Message API in *"What's new with in-app purchase"* from WWDC22
+
+### Billing Grace Period (new)
+
+Grace period allows users to maintain access to paid features while payment is being collected, without interruption.
+
+- Go to App Store Connect > App > Subscriptions > Billing Grace Period.
+- The durations shown only apply to production; in testing, the sandbox account's renewal rate is used.
+
+### Family Sharing (new)
+
+Allow customers to share digital purposes with their family members.
+
+- Go to App Store Connect > App > Subscriptions / Non-Consumable Products > enable Family Sharing
+- Organize Sandbox Family Sharing in App Store Connect
+- Make a purchase with sandbox Apple ID
+- Go to App Store Connect > Users and access > Family Sharing
+- To stop sharing, go to the device's settings, Account Settings > Family Sharing > Stop sharing
+
+Family Sharing in Sandbox allows validating:
+
+- Merchandise family-shareable products using StoreKit's `isFamilyShareable` 
+- Validate app logic to entitle service for family members
+- Revoke access for family members, validate with `revocationDate` available in JWSTransactions
+- Receive App Store Server Notifications for family members
+
+Learn more in the Tech Talk session *"Explore Family Sharing for in-app purchases."* 
+
+### iOS sandbox Account Settings (new)
+
+Options only available in App Store Connect are now available on-device for testing. Go to App Store settings > Sandbox Account > Manage, to find Renewal Rate, Test Interrupted Purchases, and Clear Purchase History.
+
+## TestFlight
+
+TestFlight allows end to end beta testing and feedback from testers. Overview:
+
+- Distribute app across all platforms
+- Add internal and external testers
+- Automatic updates
+- Builds valid for 90 days
+
+Learn more in the Tech Talk session *"Get started with TestFlight"*
+
+When testing in-app purchases:
+
+- Builds are downloaded using TestFlight app
+- Uses Apple ID signed into Media & Purchases
+- In-app purchases are free
+- Subscription renewal rates are accelerated, equivalent to Sandbox
+- If the app has implemented StoreKit's `showManageSubscription`, you can test subscription cancellation or change subscription.
+
+**New:**
+
+- Manage TestFlight testers: filter tester data like status, sessions, and bulk selection.
+- Internal Only distribution makes the build only available to internal testers, and it cannot be submitted to App Store.
+Learn more in the sessions *"What's new in App Store Connect"* and *"Simplify distribution in Xcode and Xcode Cloud"* from WWDC23.