Apple recently announced that in-app billing issues will now be handled with system-provided dialogs. Starting August 14 these dialogs will be shown to users experiencing issues with in-app subscriptions.
Starting August 14, 2023, if an auto-renewable subscription doesn’t renew because of a billing issue, a system-provided sheet will appear in your app with a prompt that lets customers update the payment method for their Apple ID. You can test this sheet in Sandbox, as well as delay or suppress it using messages and display in StoreKit. This feature is available in iOS 16.4 and iPadOS 16.4 or later, and no action is required to adopt it.Apple Developer
Developers could use API to show additional information directly in the app.
Developer:Check new APIs, consider adding additional information on billing issues, if needed.
QA engineer:Check expected application behavior, add appropriate test cases.
PM/DM:Consider adding billing issue display directly in the app to backlog.