code: def create(cls, cards, custom_headers=None):
          
  
          if custom_headers is None:
              custom_headers = {}
  
          request_map = {
              cls.FIELD_CARDS: cards
          }
          request_map_string = converter.class_to_json(request_map)
          request_map_string = cls._remove_field_for_request(request_map_string)
  
          api_client = client.ApiClient(cls._get_api_context())
          request_bytes = request_map_string.encode()
          endpoint_url = cls._ENDPOINT_URL_CREATE.format(cls._determine_user_id())
          response_raw = api_client.post(endpoint_url, request_bytes,
                                         custom_headers)
  
          return BunqResponseCardBatch.cast_from_bunq_response(
              cls._from_json(response_raw, cls._OBJECT_TYPE_POST)
          )
docs: :type user_id: int
          :param cards: The cards that need to be updated.
          :type cards: list[object_.CardBatchEntry]
          :type custom_headers: dict[str, str]|None
  
          :rtype: BunqResponseCardBatch