How to receive Access Token for OAuth 2.0 authorization using Simple.OData.Client, Grant Type 'authorization code'

Question

I am trying to POST a payload to the web server using Simple.OData.Client in .Net application.

I have the following parameters:

• Authorization = 'OAuth 2.0'
• Grand Type = 'Authorization Code'
• Callback URL = 'https://myserver.com/*'
• Auth URL = 'https://myserver.com/auth'
• Access Token URL = 'https://myserver/token'
• Client ID = 'id'
• Client Secret = 'secret'
• Scope = 'openid'
• Token Name = 'name'

I also have URL and endpoint for POST.

Using these parameters I can get Access Token and POST data successfully using Postman, the problem is to implement that on C#. As I understand it has to be 2 steps process: get Access Token, post.

Could someone provide code for getting Access Token?