Overview#OAuth Token Request process requires the OAuth Client to present the Authorization Grant (in the form of an Authorization Code) to the token_endpoint using the grant_type value authorization_code, as described in Section 4.1.3 of OAuth 2.0 RFC 6749.
The OAuth Client MUST authenticate to the token_endpoint using the HTTP Basic method, as described in 2.3.1 of RFC 6749. (This method is the one identified by using the client_secret_basic authentication method value in OpenID Connect Discovery 1.0 OpenID.Discovery).
The following is a non-normative example of such a Token Request (with line wraps for the display purposes only):
POST /token HTTP/1.1 Host: server.example.com Authorization: Basic czZCaGRSa3F0MzpnWDFmQmF0M2JW Content-Type: application/x-www-form-urlencoded grant_type=authorization_code&code=SplxlOBeZQQYbYS6WxSbIA &redirect_uri=https%3A%2F%2Fclient%2Eexample%2Ecom%2Fcb