code: def get_chat_ids(self):
          
          updates = self.get_updates()
          chat_ids = []
          if updates:
              for update in updates:
                  message = update['message']
                  if message['text'] == '/start':
                      chat_ids.append(message['chat']['id'])
          return list(set(chat_ids))
docs: Returns unique chat IDs from `/start` command messages sent to our bot by users.
          Those chat IDs can be used to send messages to chats.
  
          :rtype: list