code: def _mark_as_read(self, thing_ids, unread=False):
          
          data = {'id': ','.join(thing_ids)}
          key = 'unread_message' if unread else 'read_message'
          response = self.request_json(self.config[key], data=data)
          self.evict([self.config[x] for x in ['inbox', 'messages',
                                               'mod_mail', 'unread']])
          return response
docs: Mark each of the supplied thing_ids as (un)read.
  
          :returns: The json response from the server.