Automation library · Money admin

Send invoice payment reminders with Gmail and Google Sheets

Started by someone submitting a form, and works across Gmail, Google Sheets and Twilio. 17 steps, 3 branches, 3 loops or waits: a working afternoon to understand properly.

Medium

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

The flow

Starts it 1Logic 7Service 9

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

  1. 1Invoice Form Submission TriggerForm triggerStarts it
  2. 2Wait 7 Days for First Follow-upWaitLogic
  3. 3Check Payment Status in Sheet - Day 7Google SheetsService
  4. 4If Still Unpaid - First Check"IfLogic
  5. 5Process CompleteNo OpLogic
  6. 6Send First Payment ReminderGmailService
  7. 7Send First SMS Reminder (Optional)TwilioService
  8. 8Wait 2 Days for Second Follow-upWaitLogic
  9. 9Check Payment Status in Sheet - Day 9Google SheetsService
  10. 10If Still Unpaid - Second CheckIfLogic
  11. 11Send Second Payment Reminder EmailGmailService
  12. 12Send Second SMS Reminder (Optional)TwilioService
  13. 13Wait 3 Days for Final Follow-upWaitLogic
  14. 14Check Payment Status in Sheet - Day 12Google SheetsService
  15. 15If Still Unpaid - Third CheckIfLogic
  16. 16Send Final Payment Reminder EmailGmailService
  17. 17Send Final SMS Reminder (Optional)TwilioService

How it's built

Starts on
Someone submitting a form
Steps
17, with 3 branches, 3 loops or waits
Size
Medium: a working afternoon
Connects to
Gmail, Google Sheets, Twilio
Model
None. This is plumbing, not judgement

Questions

What does it need to run?

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

What starts it?

It starts on someone submitting a form.

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. 17 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 17 steps before you point it at anything that matters.