// Our ViewModel will check very early on if it should show the Spending Analysis Widget or not.
public override void OnAppearing()
        {
            ShowSpendingAnalysis = _featureFlagService.Can(Features.CanSeeSpendingAnalysis);
        }
...

// This method lives in a FeatureFlagService implementation. Remember to always keep your ViewModels clean!
   public bool Can(string id)
        {
            if (_client == null) Initialize();

            var results = _client.BoolVariation(id);
            // Logging would be good
            Console.WriteLine($"Feature {id} is {results} for user  {_user.Name} ({_user.Key})");
            return results;
        }