1. @override
Future revokeAuthCodeWithCode(AuthServer server, String code)

Asks this instance to delete an existing AuthCode for server.

The implementing class must delete the AuthCode for code from its persistent storage.

Source 

@override
Future revokeAuthCodeWithCode(AuthServer server, String code) {
  var query = new Query<ManagedToken>(context)..where.code = code;

  return query.delete();
}