public static async Task<string> AuthenticateAsync(string username, string password)
 {
     Console.WriteLine("Authenticating user with username {0} and password {1}", username, password);
     var authRequest = new AuthenticateUserRequest();
     authRequest["username"] = username;
     authRequest["password"] = password;
     var authResponse = await authRequest.ExecuteAsync();
     ApiHelper.EnsureValidResponse(authResponse);
     return authResponse.Token;
 }
        public async Task AuthenticateWithUsernamePasswordTestAsync()
        {

            // Create the user
            var user = await UserHelper.CreateNewUserAsync();
            var authRequest = new AuthenticateUserRequest();
            authRequest["username"] = user.Username;
            authRequest["password"] = user.Password;
            var authResponse = await authRequest.ExecuteAsync();
            ApiHelper.EnsureValidResponse(authResponse);
            Assert.IsTrue(string.IsNullOrWhiteSpace(authResponse.Token) == false, "Auth token is not valid.");
            Assert.IsNotNull(authResponse.User, "Authenticated user is null.");
            Console.WriteLine("Logged in user id: {0}", authResponse.User.Id);
            Console.WriteLine("Session token: {0}", authResponse.Token);
        }