Startup.cs

using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using System.Security.Claims;

namespace Resource.Api
{
    public class Startup
    {
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }

        public IConfiguration Configuration { get; }

        // This method gets called by the runtime. Use this method to add services to the container.
        public static void ConfigureServices(IServiceCollection services)
        {
            services.AddAuthentication(options =>
            {
                options.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme;
                options.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;                
            }).AddJwtBearer(o =>
            {
                o.Authority = "http://localhost:5000";
                o.Audience = "resourceapi";
                o.RequireHttpsMetadata = false;
            });

            services.AddAuthorization(options =>
            {
                options.AddPolicy("ApiReader", policy => policy.RequireClaim("scope", "api.read"));
                options.AddPolicy("Consumer", policy => policy.RequireClaim(ClaimTypes.Role, "consumer"));
            });

            services.AddMvc(options =>
            {
                options.EnableEndpointRouting = false;
            })
                .SetCompatibilityVersion(CompatibilityVersion.Latest);
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public static void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }

            app.UseCors(options => options.AllowAnyHeader().AllowAnyMethod().AllowAnyOrigin());

            app.UseAuthentication();

            app.UseMvc();
        }
    }
}