Braintree.TestUtil.TestHelper.GenerateValidUsBankAccountNonce C# (CSharp) Method

        public static string GenerateValidUsBankAccountNonce(BraintreeGateway gateway)
        {
            var clientToken = GenerateDecodedClientToken(gateway);
            var def =  new {
                braintree_api = new {
                    url = "",
                    access_token = ""
                }
            };
            var config = JsonConvert.DeserializeAnonymousType(clientToken, def);
            var url = config.braintree_api.url + "/tokens";
            var accessToken = config.braintree_api.access_token;
            string postData = @"
            {
                ""type"": ""us_bank_account"",
                ""billing_address"": {
                    ""street_address"": ""123 Ave"",
                    ""region"": ""CA"",
                    ""locality"": ""San Francisco"",
                    ""postal_code"": ""94112""
                },
                ""account_type"": ""checking"",
                ""routing_number"": ""021000021"",
                ""account_number"": ""567891234"",
                ""account_holder_name"": ""Dan Schulman"",
                ""account_description"": ""PayPal Checking - 1234"",
                ""ach_mandate"": {
                    ""text"": """"
                }
            }";

#if netcore
            var request = new HttpRequestMessage(new HttpMethod("POST"), url);
            byte[] buffer = Encoding.UTF8.GetBytes(postData);
            request.Content = new StringContent(postData, Encoding.UTF8, "application/json");
            request.Headers.Add("Braintree-Version", "2015-11-01");
            request.Headers.Add("Authorization", "Bearer " + accessToken);

            var httpClientHandler = new HttpClientHandler{};

            HttpResponseMessage response;
            using (var client = new HttpClient(httpClientHandler))
            {
                response = client.SendAsync(request).GetAwaiter().GetResult();
            }
            StreamReader reader = new StreamReader(response.Content.ReadAsStreamAsync().Result, Encoding.UTF8);
            string responseBody = reader.ReadToEnd();
#else
            string curlCommand = $@"-s -H ""Content-type: application/json"" -H ""Braintree-Version: 2015-11-01"" -H ""Authorization: Bearer {accessToken}"" -d '{postData}' -XPost ""{url}""";
            Process process = new Process {
                StartInfo = new ProcessStartInfo {
                    FileName = "curl",
                             Arguments = curlCommand,
                             UseShellExecute = false,
                             RedirectStandardOutput = true,
                }
            };
            process.Start();

            StringBuilder responseBodyBuilder = new StringBuilder();
            while (!process.HasExited) {
                responseBodyBuilder.Append(process.StandardOutput.ReadToEnd());
            }
            responseBodyBuilder.Append(process.StandardOutput.ReadToEnd());
            string responseBody = responseBodyBuilder.ToString();
#endif
            var resDef =  new {
                data = new {
                    id = "",
                }
            };
            var json = JsonConvert.DeserializeAnonymousType(responseBody, resDef);
            return json.data.id;
        }