Using Feature Flags and Externalized configuration .NET Core app with Flagsmith - 1

Feature_flags_with_Flagsmith-1.cs

// main interface
public interface IRemoteConfiguration
{
    Task<List<Feature>> GetFeatures();
    Task<List<Setting>> GetSettings(List<string> keys = null);
    Task<bool> IsFeatureEnabled(string key);
    Task<string> GetSettingValue(string key);
}
// other classes
public abstract class RemoteConfigEntry
{
    public string Name { get; set; }
    public abstract TValue GetValue<TValue>();
}
public abstract class RemoteConfigEntry<T> : RemoteConfigEntry
{
    public T Value { get; set; }
    public override TValue GetValue<TValue>()
    {
        return (TValue) Convert.ChangeType(Value, typeof(TValue));
    }
}
public sealed class Feature : RemoteConfigEntry<bool>
{
}
public sealed class Setting : RemoteConfigEntry<string>
{
}