Asp.net Web API Attribute Routing 404 Error

I cannot figure out for the life of me why my attribute routing isn't working.

Here is my setup:

public static class WebApiConfig
{
    public static void Register(HttpConfiguration config)
    {
        // Attribute routing
        config.MapHttpAttributeRoutes();

        // Convention-based routing
        config.Routes.MapHttpRoute(
            name: "API Default",
            routeTemplate: "api/{controller}/{action}/{id}",
            defaults: new { id = RouteParameter.Optional }
        );

    }
}

Here is my controller with my routing attributes:

[Route("api/v1.0/orders")]
public class OrdersV1Controller
{

    [APIAuthentication(RequireAuthentication = true)]
    [HttpGet]
    [Route("{id:int}")]
    public GetOrderResponse GetOrder(int id)
    { 
      .....
    }
}

Here is my global asax file:

public class Global : HttpApplication
{
    void Application_Start(object sender, EventArgs e)
    {
        AreaRegistration.RegisterAllAreas();
        GlobalConfiguration.Configure(WebApiConfig.Register);
        RouteConfig.RegisterRoutes(RouteTable.Routes);
        GlobalConfiguration.Configuration.Formatters.JsonFormatter.SerializerSettings.DefaultValueHandling = Newtonsoft.Json.DefaultValueHandling.Populate;
    }
}

Here is the URL i'm testing which is returning a 404 not found:

http://localhost:60105/api/v1.0/orders/111111