How do I implement MapKit MKLocalSearch.Request() in SwiftUI?

Is there an Xcode project of "The Coast" that we can download to see how the Game Center functionality is implemented in SwiftUI? Is there anything different I would have to do if I wanted to use it in a multi-platform app? I would be interested in seeing a .swift file that has a complete Game Center implementation.

In the session "Introducing StoreKit Testing in Xcode" There is a sample project that can be downloaded ( https://developer.apple.com/documentation/swiftui/fruta_building_a_feature-rich_app_with_swiftui ). This download does not have the StoreKit files shown in the example during the session. It is missing the following files Store.swift NonConsumable.storekit Subscription.storekit ReceiptHelpers - (this is a group folder and we cannot see the files contained in it when shown during the session) Are these files available for download, so that we can see the code used to set up StoreKit for an app?