@available(iOS 3, tvOS 9, OSX 10.7, *)
public class StoreKitPurchaseTracker : PurchaseTracker

Example of validation of features by StoreKit In-App Purchase or subscription ID.

Note that this code could be easily hacked on jailbroken devices. You may need to add your own app-specific logic to verify this so there isn’t a single point of verification, and to check receipts.