code: def serialize(cls, installation):
          
  
          return [
              {cls._FIELD_ID: converter.serialize(installation.id_)},
              {cls._FIELD_TOKEN: converter.serialize(installation.token)},
              {
                  cls._FIELD_SERVER_PUBLIC_KEY: converter.serialize(
                      installation.server_public_key
                  ),
              },
          ]
docs: :type installation: core.Installation
  
          :rtype: list