@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.
Called to see if a specific product has been purchased
public func isPurchased(_ productID: String) -> Bool?