How do I get an OAuth 2.0 authentication token in C#

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In Postman, click Generate Code and then in Generate Code Snippets dialog you can select a different coding language, including C# (RestSharp).

Also, you should only need the access token URL. The form parameters are then:

grant_type=client_credentials
client_id=abc    
client_secret=123

Code Snippet:

/* using RestSharp; // https://www.nuget.org/packages/RestSharp/ */

var client = new RestClient("https://service.endpoint.com/api/oauth2/token");
var request = new RestRequest(Method.POST);
request.AddHeader("cache-control", "no-cache");
request.AddHeader("content-type", "application/x-www-form-urlencoded");
request.AddParameter("application/x-www-form-urlencoded", "grant_type=client_credentials&client_id=abc&client_secret=123", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);

From the response body you can then obtain your access token. For instance for a Bearer token type you can then add the following header to subsequent authenticated requests:

request.AddHeader("authorization", "Bearer <access_token>");

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