This is a sample to use MTAdmob: https://github.com/marcojak/MTAdmob.
With MTAdmob you can add a Google Admob Ads inside your Xamarin Android and iOS Projects with a single line!!! This plugin supports: Banners, Interstitial and Rewarded Videos
A complete tutorial is available here: https://www.xamarinexpert.it/admob-made-easy/
Available on Nuget: https://www.nuget.org/packages/MarcTron.Admob
Tutorial: https://www.xamarinexpert.it/admob-made-easy/
Source code for MTAdmob: https://github.com/marcojak/MTAdmob
To report any issue: https://github.com/marcojak/TestMTAdmob