@kenaki We can cancel a subscription in TestFlight, but need to wait 1 day for stopping it. Alternatively, we can stop it by requesting a refund, and it will stop in 10 min after doing so. Our app has a "Request a Refund" button as described in Human Interface Guidelines.

In TestFlight, we need at most 1 day to stop a subscription by cancelling, but less than 10 min by requesting a refund. Our app has a "Request a Refund" button as described in the following: https://developer.apple.com/design/human-interface-guidelines/in-app-purchase#Providing-help-with-in-app-purchases

Calling Product.products(for:) without internet emits StoreKit.StoreKitError.networkError if the app didn't cache product data. This error can be caught to trigger UI changes.