Scheduled reminders for unpaid invoices, in three escalation levels

Every morning the agent spots overdue invoices in your sheet and prepares the right reminder (friendly, firm, pre-formal notice for you to approve).

L2 semi-autonomousVerified sourceBased on official documentation we checked; not tested by us yet. · updated 16/10/2026

Difficulty: Intermediate
Setup time: 2 h
Estimated cost: €0–10/month
Category: Small business & freelancers

⏱ Trigger

Every weekday at 7am (cron)

✋ Human approval

Drafts by default; the formal-notice level (3) always needs your approval.

→ Output

Gmail drafts + status in Sheets

Autonomy level 2 — Semi-autonomous (approval): Runs on its own but waits for your approval before anything sensitive.

01Connected tools

02What the agent does on its own

step 01

Reads the invoice sheet (client, due date, status).

step 02

Computes the delay and picks the reminder level.

step 03

Writes the reminder and creates a Gmail draft (levels 1 and 2 can be sent automatically if you enable it).

step 04

Logs the reminder date in the sheet.

03Agent instructions

$ instructions.txt · replace the {VARIABLES}

> Write a level {LEVEL} reminder (1 friendly, 2 firm, 3 before formal notice) for invoice {NUMBER} of {AMOUNT}, due on {DUE_DATE}. At most 90 words; mention the late-payment penalties in the contract only at level 2 or 3.

04Limits and legal points

Check that no payment is already on its way before each reminder.

05Source

https://docs.n8n.io/integrations/builtin/app-nodes/n8n-nodes-base.gmail/

06In the same category

#012 h

Automatic checks on supplier invoices received by email

For every invoice received, the agent extracts the data, checks the mandatory legal mentions, logs it in your sheet and flags anomalies.

⏱ New email with a PDF invoice (event)

L2 semi-autonomousVerified source

#022 h

Automatic meeting notes pushed to your CRM

As soon as the Google Meet transcript is ready, the agent writes the minutes, extracts action items and adds them to the client record in your CRM.

⏱ New Meet transcript in Google Drive (event)

L2 semi-autonomousVerified source

#031.5 h

Automatic triage of your work inbox with draft replies

For every incoming email the agent classifies it (quote, support, invoice, sales pitch), applies a label and prepares a draft for customer requests.

⏱ New email received (event)

L2 semi-autonomousVerified source

Scheduled reminders for unpaid invoices, in three escalation levels

01Connected tools

02What the agent does on its own

03Agent instructions

04Limits and legal points

05Source

06In the same category

Automatic checks on supplier invoices received by email

Automatic meeting notes pushed to your CRM

Automatic triage of your work inbox with draft replies

3 agents en vrai.Every week.

3 agents en vrai.
Every week.