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Monetize your apps with a simple In-App Purchase plugin for Xamarin and Windows to query item information, purchase items, restore items, and more. By James Montemagno.
https://github.com/jamesmontemagno/InAppBillingPlugin

Michael Flanakin joins Scott Hanselman to show how the Azure mobile app keeps you connected to your Azure resources anytime, anywhere.
https://channel9.msdn.com/Shows/Azure-Friday/Azure-Mobile-App-Overview

You’ve seen the Azure Mobile App, now see how it was built.
https://channel9.msdn.com/Shows/Azure-Friday/Azure-Mobile-App-Under-the-Hood

Nish Anil show you how to build face recognition into your Android apps with Xamarin and the Microsoft Cognitive Services API
https://blog.xamarin.com/adding-face-tracking-live-recognition-android-app/

Jeremy Lindsay helps with troubleshooting the default install of Xamarin with Visual Studio 2017
https://jeremylindsayni.wordpress.com/2017/07/09/troubleshooting-the-default-install-of-xamarin-with-visual-studio-2017-and-windows-10-creators-update/

Brian Lagunas investigates Mocking and Unit Testing the Xamarin.Forms Application class
http://brianlagunas.com/mocking-and-unit-testing-the-xamarin-forms-application-class/

Craig Dunn, from the Mobile Developer Tools documentation team, introduces some hands on labs that demonstrate some exciting features of Visual Studio for Mac.
https://blogs.msdn.microsoft.com/visualstudio/2017/06/22/hands-on-with-visual-studio-for-mac/