Which functions to use for obtaining id_token given Authorization Code

[quackerjeff]

The thought was using the returned "code" from the login and pass that into our backend server. The backend server would be responsible for obtaining the id_token for needed use. I've looked at all the functions or operations and I can't find anything that would seem to fit. I'm trying to do in Go code the following:
curl --location --request POST 'https://mycognitodomain.auth.us-east-1.amazoncognito.com/oauth2/token' \ --header 'Content-Type: application/x-www-form-urlencoded' \ --header 'Authorization: Basic <base64 encoded client_id:client_secret>' \ --data-urlencode 'grant_type=authorization_code' \ --data-urlencode 'client_id=<client_id>' \ --data-urlencode 'code=<use the code you received post login>' \ --data-urlencode 'redirect_uri=https://myapp.com'
without having to write my own http client/handler.

1. Can someone point me in the right direction?
2. Am I going about this in the completely wrong way?