C# Example to Generate an Access Token

Modified on Thu, 14 Sep 2023 at 03:16 PM

For supply queries, try using the code below:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Text;
using System.Text.Json;
using System.Text.Json.Serialization;
using System.Threading.Tasks;

namespace ClientCredentialsFlowExample
    internal class Program
        public static async Task Main(string[] args)
            string tokenEndpoint = "https://identity.nexar.com/connect/token";
            string clientId = "YOUR_CLIENT_ID";
            string clientSecret = "YOUR_CLIENT_SECRET";

            var httpClient = new HttpClient();

            var request = new HttpRequestMessage(HttpMethod.Post, tokenEndpoint);
            request.Headers.Authorization = CreateBasicAuthenticationHeader(clientId, clientSecret);
            request.Content = new FormUrlEncodedContent(
                new Dictionary<string, string>
                    { "grant_type", "client_credentials" },
                    { "scope", "supply.domain" }

            var response = await httpClient.SendAsync(request);

            string content = await response.Content.ReadAsStringAsync();
            var respObj = JsonSerializer.Deserialize<TokenResponse>(content);
            string accessToken = respObj.AccessToken;

            Console.WriteLine($"Access token: {accessToken}");

        private static AuthenticationHeaderValue CreateBasicAuthenticationHeader(string clientId, string clientSecret)
            string creds = $"{clientId}:{clientSecret}";
            string encodedCreds = Convert.ToBase64String(Encoding.UTF8.GetBytes(creds));
            return new AuthenticationHeaderValue("Basic", encodedCreds);

    internal class TokenResponse
        public string AccessToken { get; set; }

        public int ExpiresIn { get; set; }

        public string Scope { get; set; }

For this code to work, you will need to ensure the NuGet package System.Text.Json is installed. The code assumes .NET Framework 4.8, so may need small adaptations to work on other .NET versions.

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