
PrabhjotS.60337 (Customer) asked a question.
We have a requirement to enable "code id_token" as response_type, however, it's not very clear, which grant_type works for this (Generally. we prefer to use "authorization_code" grant_type only. Is there a document I can refer for this?

The grant_type would be authorization_code. When response_type has code in it, I believe it's safe to say that it's some sort of authorization code flow and therefore the grant_type should reflect that.
These references may also be useful:
https://developer.okta.com/docs/reference/api/oidc/#request-parameters
https://developer.okta.com/docs/reference/api/oidc/#request-parameters-2