Automation library · Money admin

WhatsApp AI Receipt and Expense Tracker for n8n

Started by another system calling it, and works across Google Drive, Google Sheets and WhatsApp. 18 steps, 3 branches: a working afternoon to understand properly.

Medium

Download free
18 stepsMedium: a working afternoon
3Branches: places the flow splits
0Loops or waits
3Services it connects to

The flow

Starts it 1Logic 9Service 8

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

  1. 1WA Finance Inbox POSTWebhookStarts it
  2. 2Normalize EventCodeLogic
  3. 3Is Command?IfLogic
  4. 4Parse ExtractionCodeLogic
  5. 5Has Media?IfLogic
  6. 6Is Command Response?IfLogic
  7. 7Get WhatsApp Media URLWhats AppService
  8. 8Build Text AI PayloadCodeLogic
  9. 9Reply on WhatsAppWhats AppService
  10. 10Read Existing ExpensesGoogle SheetsService
  11. 11Download Media BinaryHttp RequestService
  12. 12Call OpenRouter ExtractorHttp RequestService
  13. 13Check DuplicateCodeLogic
  14. 14Prepare Media EvidenceCodeLogic
  15. 15Append Expense RowGoogle SheetsService
  16. 16Upload Evidence to DriveGoogle DriveService
  17. 17Append Document LogGoogle SheetsService
  18. 18Build Media AI PayloadCodeLogic

How it's built

Starts on
Another system calling it
Steps
18, with 3 branches
Size
Medium: a working afternoon
Connects to
Google Drive, Google Sheets, WhatsApp
Model
None. This is plumbing, not judgement

Questions

What does it need to run?

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

What starts it?

It starts on another system calling it.

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. 18 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 18 steps before you point it at anything that matters.