code: def transmit(self, payload, **kwargs):
          
          items_to_create, items_to_update, items_to_delete, transmission_map = self._partition_items(payload)
          self._prepare_items_for_delete(items_to_delete)
          prepared_items = {}
          prepared_items.update(items_to_create)
          prepared_items.update(items_to_update)
          prepared_items.update(items_to_delete)
  
          skip_metadata_transmission = False
  
          for chunk in chunks(prepared_items, self.enterprise_configuration.transmission_chunk_size):
              chunked_items = list(chunk.values())
              if skip_metadata_transmission:
                  # Remove the failed items from the create/update/delete dictionaries,
                  # so ContentMetadataItemTransmission objects are not synchronized for
                  # these items below.
                  self._remove_failed_items(chunked_items, items_to_create, items_to_update, items_to_delete)
              else:
                  try:
                      self.client.update_content_metadata(self._serialize_items(chunked_items))
                  except ClientError as exc:
                      LOGGER.error(
                          'Failed to update [%s] content metadata items for integrated channel [%s] [%s]',
                          len(chunked_items),
                          self.enterprise_configuration.enterprise_customer.name,
                          self.enterprise_configuration.channel_code,
                      )
                      LOGGER.error(exc)
  
                      # Remove the failed items from the create/update/delete dictionaries,
                      # so ContentMetadataItemTransmission objects are not synchronized for
                      # these items below.
                      self._remove_failed_items(chunked_items, items_to_create, items_to_update, items_to_delete)
  
                      # SAP servers throttle incoming traffic, If a request fails than the subsequent would fail too,
                      # So, no need to keep trying and failing. We should stop here and retry later.
                      skip_metadata_transmission = True
  
          self._create_transmissions(items_to_create)
          self._update_transmissions(items_to_update, transmission_map)
          self._delete_transmissions(items_to_delete.keys())
docs: Transmit content metadata items to the integrated channel.