For the Google UserMessagingPlatform, you could use Xamarin.Google.UserMessagingPlatform in your project to integrate this functionality.
The official repository for Xamarin Binding for Google services is GooglePlayServicesComponents. If you encounter a bug while using these services, or have a new service request, you could post to this repository.
The corresponding packages are published in NuGet with namespaces under Xamarin.Google.
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