Make sure to include the nuget package in your app projects as well as your shared/PCL library

For Android only, please add the following to your AndroidManifest.xml

<uses-permission android:name="com.samsung.android.providers.context.permission.WRITE_USE_APP_FEATURE_SURVEY" />

And then in your shared/PCL library, simply check if the sensor is available:

if (Biometrics.Instance.IsAvailable) {
    var success = await Biometrics.Instance.Evaluate("Your custom message");
    if (success) {
        ...
    }
}

NOTE: Currently, fingerprint sensors only work with Samsung enabled devices

Android Binding for Samsung Pass courtesy of (Shane Raiteri) https://github.com/sraiteri/Xamarin-Samsung-Pass