code: def _transmit_create(self, channel_metadata_item_map):
          
          for chunk in chunks(channel_metadata_item_map, self.enterprise_configuration.transmission_chunk_size):
              serialized_chunk = self._serialize_items(list(chunk.values()))
              try:
                  self.client.create_content_metadata(serialized_chunk)
              except ClientError as exc:
                  LOGGER.error(
                      'Failed to update [%s] content metadata items for integrated channel [%s] [%s]',
                      len(chunk),
                      self.enterprise_configuration.enterprise_customer.name,
                      self.enterprise_configuration.channel_code,
                  )
                  LOGGER.error(exc)
              else:
                  self._create_transmissions(chunk)
docs: Transmit content metadata creation to integrated channel.