Sitefinity - Custom WebService

GetPromos.cs

[HttpGet]
public HttpResponseMessage GetPromos()
{
    if (ClaimsManager.GetCurrentUserId() == Guid.Empty)
    {
        throw new Exception("You need to authenticate first");
    }

    var manager = DynamicModuleManager.GetManager();

    var promos = manager.GetLiveDataItemsForType(ScootConstants.CountryPromotion_DynamicType)                            
                        .ToListOf<PromoGroup>();

    return Request.CreateResponse(HttpStatusCode.OK, new { Result = ScootConstants.Success, Data = promos });
}

global.asax.cs

protected void Application_Start(object sender, EventArgs e)
{
       SystemManager.ApplicationStart += SystemManager_ApplicationStart;
}

private void SystemManager_ApplicationStart(object sender, EventArgs e)
{   
    RegisterRoutes(RouteTable.Routes);
}

private void RegisterRoutes(RouteCollection routes)
{
    routes.Ignore("{resource}.axd/{*pathInfo}");
    
    // register a custom route /ajax/ for custom webservices
    routes.MapHttpRoute(
        name: "DefaultApi",
        routeTemplate: "ajax/{controller}/{action}/{id}",
        defaults: new { id = RouteParameter.Optional }
        );
}