Why am I not receiving updates for StoreKit transactions when my subscription has expired in Swift?

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When your subscription has expired, you will not receive updates for StoreKit transactions because the subscription is no longer active. You can check the subscription status using the SKPaymentTransaction object's transactionReceipt property and verify it using the App Store receipt validation server. Once the subscription has expired, you can offer the user options to re-subscribe or upgrade to a different subscription.