Using In-App Purchasing and In-App Billing to a Xamarin.Android in Xamarin.Forms

Hi,
I am beginner in Xamarin.Forms and I'am not sure if it passible to use native purchase functionalities for iOS and Android Xamarin apps.

Such as:
https://components.xamarin.com/view/xamarin.inappbilling
https://developer.xamarin.com/guides/ios/application_fundamentals/in-app_purchasing/

Can You explain me it?
Thx for help, Karol