It's possible to put your Telegram bot communication into Zammad. To do so, you need to follow these steps.
Note: Your Zammad instance needs to be publicly available via HTTPS (we use Telegram WebHooks).
Register your Telegram bot via your Telegram client, see also here: https://core.telegram.org/bots#3-how-do-i-create-a-bot
Go to BotFather
Register a new bot by using "/newbot" and define its name and username
All done, you will get your Telegram bot API token
Go to "Admin -> Channels -> Telegram" and click "Add Bot"
Enter your "API Token", your "welcome message" and set the incoming group.
Done, your Zammad is configured as Telegram bot now.
Go to your Telegram client, search for your new Telegram bot and start writing a message.
After a few seconds a new message in Zammad appears.
Just click on reply button (as you do it for emails) to send a reply.
The message will appear in your Telegram client.