Generic FitBitClient Methods

CallingProgram.cs

class Program
    {
        static void Main(string[] args)
        {
           var client = new FitBitClient(); //pretending there are no dependencies for brevity.
           var user = client.Get<UserProfile>(new GetUserProfileRequest("someUser"));
        }
    }

FitBitClient.cs

//Just a spike of a generic Get<T> method.
//I based this on the GetUserProfile method.
//It's rough, and I need to look through the rest of the methods to see what I might have missed.

public class FitBitClient
{
//removed everything else
public T Get<T>(IGetRequest getRequest) where T : new()
        {
            string apiCall = getRequest.FormatApiCall();

            var request = new RestRequest(apiCall);

            if (!string.IsNullOrWhiteSpace(getRequest.RootElementName))
                request.RootElement = getRequest.RootElementName;

            var response = restClient.Execute<T>(request);
            HandleResponseCode(response.StatusCode);

            return response.Data;
        }
}

GetNullUserProfileRequest.cs

public class GetNullUserProfileRequest : IGetRequest
    {
        public string FormatApiCall()
        {
            return "/1/user/-/profile.xml";
        }

        public string RootElementName
        {
            get { return "user"; }
        }
    }

GetUserProfileRequest.cs

public class GetUserProfileRequest : IGetRequest
    {
        public string RootElementName
        {
            get { return "user"; }
        }

        readonly string _encodedUserId;

        public GetUserProfileRequest(string encodedUserId)
        {
            _encodedUserId = encodedUserId;
        }

        public string FormatApiCall()
        {
            return string.Format("/1/user/{0}/profile.xml", _encodedUserId);
        }        
    }

IGetRequest.cs

public interface IGetRequest
    {
        string FormatApiCall();
        string RootElementName { get; }
    }