I have an early-stage SOS emergency iOS app and need the subscription layer built first. The app will eventually include features such as a prominent Panic button, Location tracking and Emergency contacts messaging, but for this phase my priority is a seamless in-app purchase gateway that unlocks those premium functions. The task – Configure Apple In-App Purchase using StoreKit (StoreKit2 preferred) to support three auto-renewable plans: quarterly, half-yearly and yearly. – Build a simple Swift-based interface that shows locked / unlocked states and routes the user through the purchase, restore, and cancellation flows. – Handle receipt validation securely (on-device and, if you favour it, a lightweight server endpoint). – Supply clear setup notes so I can recreate the products in App Store Connect and pass App Review without hiccups. Deliverables • Xcode project (Swift 5 / SwiftUI, iOS 16+) with clean, well-commented code • Functional sandbox TestFlight build demonstrating all three subscription tiers • README or screencast that walks through configuration, testing and renewal simulation Acceptance criteria A reviewer running the TestFlight build can purchase, restore and see each tier renew correctly in the sandbox, with the app reflecting the new entitlement state every time. Once this foundation is rock-solid we will expand into the Panic button workflow, location services and emergency messaging, so well-structured code that can grow is important.