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Protect Telegram groups with Google Sheets

Started by an incoming Telegram message, and works across Google Sheets and Telegram. 15 steps, 2 branches: a working afternoon to understand properly.

Medium

15 stepsMedium: a working afternoon
2Branches: places the flow splits
0Loops or waits
2Services it connects to

The flow

Starts it 1Logic 5Service 9

The steps in the order they run, from what starts it.

  1. 1๐Ÿ“ฑ Telegram TriggerTelegram triggerStarts it
  2. 2โš™๏ธ Bot ConfigurationSetLogic
  3. 3๐Ÿ” Check New MemberIfLogic
  4. 4๐ŸŽฒ Generate CAPTCHA QuestionCodeLogic
  5. 5๐Ÿ“‹ Find Pending CAPTCHAGoogle SheetsService
  6. 6โ“ Send CAPTCHA QuestionTelegramService
  7. 7๐Ÿ—‘๏ธ Delete CAPTCHA Question (Success)TelegramService
  8. 8๐Ÿ—‘๏ธ Delete Join MessageTelegramService
  9. 9โœ… Verify AnswerIfLogic
  10. 10๐Ÿ’พ Store User AnswerGoogle SheetsService
  11. 11๐ŸŽ‰ Welcome New MemberTelegramService
  12. 12Create URL for banrequestSetLogic
  13. 13๐Ÿ—‘๏ธ Delete User MessageTelegramService
  14. 14๐Ÿšซ Ban User (Failed CAPTCHA)Http RequestService
  15. 15๐Ÿ—‘๏ธ Clean User Data (Success)Google SheetsService

How it's built

Starts on
An incoming Telegram message
Steps
15, with 2 branches
Size
Medium: a working afternoon
Connects to
Google Sheets, Telegram
Model
None. This is plumbing, not judgement

Questions

What does it need to run?

An n8n account, plus your own Google Sheets and Telegram accounts. You connect your own accounts after importing it; none are included.

What starts it?

It starts on an incoming Telegram message.

Does it use AI?

No. Every step is fixed logic or a call to a service, so it does the same thing every time.

How long does it take to set up?

Plan an afternoon. 15 steps is enough that you should read each one before running it.

How do I import it?

Copy the workflow, open a new workflow in n8n and paste. The steps appear on the canvas, ready for your own accounts.

Before you run it

Nothing here has been tested by us. It is somebody's working automation, read and described from its own steps. Treat the connections it wants as a list of accounts it will touch, and read the 15 steps before you point it at anything that matters.