Accessing API's with OAuth2 accounts

// Note that this is vanilla Javascript to illustrate how to obtain and use an Access Token. You will need to add caching of your token since obtaining an access token for each request will generate poor performance.
const response = await fetch(url, {
  method: "POST",
  headers: {
    "Content-Type": "application/x-www-form-urlencoded"
  },
  body: {
    client_id: "<OAuth2 User ID>",
    client_secret: "<OAuth2 User Secret>",
    grant_type: "client_credentials",
    scope: "[lab|production]"
  }
});
let oauthResponse = response.json();

/* Note that these are vanilla C# illustrations, more like pseudo-code, on how to obtain and use an Access Token. You might want to use IdentityModel and/or other frameworks in your implementation. */

var cache = new CachingService();
var httpClient = new HttpClient();
var oauthClientId = "<OAuth User Id>";
var oauthClientSecret = "<OAuth User Secret>";
var environment = "<lab | production>";

string accessToken = cache.GetOrAdd("AuthorizationToken", () =>
{
    var requestBody =
        $"client_id={oauthClientId}" +
        "&client_secret={oauthClientSecret}" +
        "&grant_type=client_credentials" +
        "&scope={environment}";
    var tokenRequest = new HttpRequestMessage
    {
        RequestUri = new Uri("https://identity.storm.io/1.0/connect/token"),
        Content = new StringContent(requestBody,
            Encoding.UTF8,
            "application/x-www-form-urlencoded"),
        Method = HttpMethod.Post
    };
    var httpResponse = httpClient.Send(tokenRequest);

    if (!httpResponse.IsSuccessStatusCode)
    {
        // Handle error
        return null;
    }
    var response = JsonSerializer.Deserialize<Dictionary<string, object>>(httpResponse.Content.ReadAsStringAsync().GetAwaiter().GetResult());
    return response["access_token"].ToString();
}, DateTimeOffset.Now.AddSeconds(500));

const response = await fetch(url, {
  method: "GET",
  headers: {
    ApplicationId: "<Numeric ApplicationId>",
    Authorization: "Bearer "+oauthResponse.access_token
  }
});

var request = new HttpRequestMessage
{
    RequestUri = new Uri("<API Endpoint>"),
    Method = HttpMethod.Get,
    Headers =
    {
        {"Authorization", "Bearer "+accessToken},
        {"ApplicationId", "<Numeric ApplicationId>"}
    }
};
var methodResponse = httpClient.Send(request);