public static async Task <TokenResponse> RequestTokenAsync(this HttpMessageInvoker client, TokenRequest request, CancellationToken?cancellationToken = null)
        {
            Request request1 = request.Clone();

            if (!request1.Parameters.ContainsKey("grant_type"))
            {
                request1.Parameters.AddRequired("grant_type", request.GrantType, false);
            }
            ConfiguredTaskAwaitable <TokenResponse> configuredTaskAwaitable = HttpClientTokenRequestExtensions.RequestTokenAsync(client, request1, cancellationToken).ConfigureAwait(false);

            return(await configuredTaskAwaitable);
        }
        public static async Task <TokenResponse> RequestPasswordTokenAsync(this HttpMessageInvoker client, PasswordTokenRequest request, CancellationToken?cancellationToken = null)
        {
            Request request1 = request.Clone();

            request1.Parameters.AddRequired("grant_type", "password", false);
            request1.Parameters.AddRequired("username", request.UserName, false);
            request1.Parameters.AddRequired("password", request.Password, true);
            request1.Parameters.AddOptional("scope", request.Scope);
            ConfiguredTaskAwaitable <TokenResponse> configuredTaskAwaitable = HttpClientTokenRequestExtensions.RequestTokenAsync(client, request1, cancellationToken).ConfigureAwait(false);

            return(await configuredTaskAwaitable);
        }