Xamarin.Android reCAPTCHA

            var response = SafetyNetClass.GetClient(Platform.CurrentActivity).VerifyWithRecaptchaAsync("llllllllllllll").Result;
            if (!string.IsNullOrEmpty(response.TokenResult))
            {
                // Validate the user response token using the
                // reCAPTCHA siteverify API.
                Console.WriteLine("####### reCAPTCHA siteverify API:" + response.TokenResult);
            }
            else
            {
                Console.WriteLine("####### reCAPTCHA siteverify API Error:" + response.ToString());
            }