//Startup.cs (Auth c# project)
public void Configuration(IAppBuilder app) {
    var inMemoryManager = new InMemoryManager();
    var factory = new IdentityServerServiceFactory()
        .UseInMemoryClients(inMemoryManager.GetClients())
        .UseInMemoryScopes(inMemoryManager.GetScopes())
        .UseInMemoryUsers(inMemoryManager.GetUsers());

    var options = new IdentityServerOptions {
        Factory = factory,
        RequireSsl = false
    };

    app.UseIdentityServer(options);
}

//InMemoryManager.cs
public class InMemoryManager {
    public List<InMemoryUser> GetUsers() {
        return new List<InMemoryUser> {
            new InMemoryUser {
                Username = "alice",
                Password = "password",
                Subject = "2",
                Claims = new [] {
                    new Claim("User name", "Alice")
                }
            }
        };
    }

    public IEnumerable<Scope> GetScopes() {
        return new[] {
            new Scope {
                Name = "api1",
                DisplayName = "API 1"
            }
        };
    }

    public IEnumerable<Client> GetClients() {
        return new[] {
            new Client {
                ClientName = "Silicon on behalf of Carbon Client",
                ClientId = "carbon",
                Enabled = true,
                //AccessTokenType = AccessTokenType.Reference,

                Flow = Flows.ResourceOwner,

                ClientSecrets = new List<Secret> {
                    new Secret("secret".Sha256())
                },

                AllowedScopes = new List<string> {
                    "api1"
                }
            }
        };
    }
}