Top 20 NuGet appstore Packages

Library for validating receipts with the App Store
Easily detect if you are running the latest version of your Xamarin or UWP app and open it in the App Store, Play Store or Microsoft Store to update it.
CrossPlatformLibrary.Market is a plug-in for accessing platform-independent app market functionality.
This will add WIF configuration required for AppStore identity integration
AppStoresScraper is library for downloading app metadata from Steam, Google, Apple and Windows app stores
It should help your project to connect to the AppStoreConnect APIs. https://developer.apple.com/documentation/appstoreconnectapi
Xamarin.iOS.Harpy
Notify user when a new version of your app is available.
Licensing toolkit for .NET addins and apps to be distributed on the Massif platform.