more references.

Config.cs

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+using System.Collections.Generic;
+using IdentityServer4;
+using IdentityServer4.Models;
+using IdentityServer4.Test;
+
+namespace nuget_host
+{
+    public static class Config
+{
+    public static IEnumerable<IdentityResource> IdentityResources =>
+        new List<IdentityResource>
+        {
+            new IdentityResources.OpenId(),
+            new IdentityResources.Profile(),
+        };
+
+    public static IEnumerable<ApiResource> ApiResources =>
+        new List<ApiResource>
+        {
+            new ApiResource(scope_packages)
+        };
+
+    public const string scope_packages = "packages";
+
+    public static IEnumerable<Client> Clients =>
+        new List<Client>
+        {
+            // machine to machine client
+            new Client
+            {
+                ClientId = "client",
+                ClientSecrets = { new Secret("secret".Sha256()) },
+
+                AllowedGrantTypes = GrantTypes.ClientCredentials,
+                // scopes that client has access to
+                AllowedScopes = { scope_packages }
+            },
+
+            // interactive ASP.NET Core MVC client
+            new Client
+            {
+                ClientId = "mvc",
+                ClientSecrets = { new Secret("secret".Sha256()) },
+
+                AllowedGrantTypes = GrantTypes.Code,
+
+                // where to redirect to after login
+                RedirectUris = { "https://localhost:5002/signin-oidc" },
+
+                // where to redirect to after logout
+                PostLogoutRedirectUris = { "https://localhost:5002/signout-callback-oidc" },
+
+                AllowedScopes = new List<string>
+                {
+                    IdentityServerConstants.StandardScopes.OpenId,
+                    IdentityServerConstants.StandardScopes.Profile,
+                    scope_packages
+                }
+            }
+        };
+
+        public static List<TestUser> TestUsers { get; internal set; }
+    }
+}