@Override
    public OAuth20GrantTypes getGrantType() {
        return OAuth20GrantTypes.AUTHORIZATION_CODE;
    }
This is {@link AccessTokenAuthorizationCodeGrantRequestExtractor}.

@author Misagh Moayyed
@since 5.1.0
support/cas-server-support-oauth-core-api/src/main/java/org/apereo/cas/support/oauth/web/response/accesstoken/ext/AccessTokenAuthorizationCodeGrantRequestExtractor.java