Add In app Purchase to SwiftUI App

Good day We need a freelancer to create in app purchase page to our project. The page should contain small description and 3 button of choosing customer plan. The system should check subscription status and if it is payed, in app purchase page would hide and automatically give access to main view controller. When the term of purchase plan expiry, in app purchase page appear automatically and the system save all information on main view controller. In code we would like to lines for key, id, price and other product description to add it and connect to App Store in the end. Thank you Waiting for your offers