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var attributes = property.GetCustomAttributes<Google.Apis.Util.RequestParameterAttribute>();            
                if (attributes != null && attributes.Count() > 0)
                {
                    var attribute = attributes.ElementAt (0);
                    string name = attribute.Name ?? property.Name.ToLower();
                    object valueObject = property.GetValue(this, new object[] {} );
                    string value = String.Empty;
                    if (valueObject != null)
                    {
                        value = valueObject.ToString();
                    }

                    requestBuilder.AddParameter(attribute.Type, name, value);
                }

 public void SignIn()
 {
     Debug.WriteLine("In SignIn");
     if (GdAuthenticator == null)
     {
         (App.GdClientId, App.GdRedirectUrl, App.GdClientSecret) = App.SetIDs4GoogleDrive();
         Debug.WriteLine($"GdRedirectUrl: {App.GdRedirectUrl}");
         GdAuthenticator = new OAuth2Authenticator(
             App.GdClientId,
             App.GdClientSecret,
             App.GdScope,
             new Uri("https://accounts.google.com/o/oauth2/v2/auth"),
             new Uri(App.GdRedirectUrl),
             new Uri("https://www.googleapis.com/oauth2/v4/token"),
             isUsingNativeUI: true);
         GdAuthenticator.Completed += Auth_Completed;
         AuthenticatorHelper.OAuth2Authenticator = GdAuthenticator;
     }
     // This flag is set here as for iOS, AppDelegate.OpenUrl is invoked even before
     //    this.Auth_Completed event is invoked and this flag is needed to redirect
     //    to this app after authentication
     if (Device.RuntimePlatform == Device.iOS)
         App.StorageServiceSignedIn = App.StorageServices.GoogleDrive;
     OAuthLoginPresenter presenter = new OAuthLoginPresenter();
     presenter.Login(GdAuthenticator);
 }