code: def notify(self, data):
          
          string_channels = {
              ChannelIdentifiers.de_registrations,
              ChannelIdentifiers.registrations_expired
          }
  
          if data['channel'] in string_channels:
              message = {'device_id': data["value"], 'channel': data["channel"]}
          else:
              message = DeviceStateChanges._map_endpoint_data(data)
  
          return super(DeviceStateChanges, self).notify(message)
docs: Notify this channel of inbound data