WebAPI-DealerSelection/Source/DealerSelection.WebApi/App_Start/WebApiConfig.cs

using Microsoft.Owin.Security.OAuth;
using System.Web.Http;

namespace DealerSelection.WebApi.App_Start;

public class WebApiConfig
{
    public static void Register(HttpConfiguration config)
    {
        // Web API configuration and services    
        config.SuppressDefaultHostAuthentication();
        config.Filters.Add(new HostAuthenticationFilter(OAuthDefaults.AuthenticationType));

        // Web API routes    
        config.MapHttpAttributeRoutes();

        config.Routes.MapHttpRoute(
         name: "DefaultApi",
         routeTemplate: "api/{controller}/{action}/{id}",
         defaults: new
         {
             id = RouteParameter.Optional
         }
        );
    }
}