Prerequisites:
- create Telegram bot
- create a project in Google Apps Script
- set webhook for bot
Code in the example implements the following:
- handle POST requests with updates from Telegram
- log the date, author and text of the update into a Google spreadsheet
- notify bot owner about the update
You can find few tips here (in Russian): https://research-based.blogspot.com/2020/02/telegram-bot-google-apps-script.html