# Invoice overdue reminder system - delivered with Airtable: n8n workflow

> Started by another system calling it, and works across Airtable, Email and Twilio. 21 steps, 6 branches: large, and worth reading before you trust it with...

Source: https://millionrounds.com/workflow/invoice-overdue-reminder-system-delivered-with-airtable (Millionrounds; every figure on the page links to its filing or article)

[Automation library](https://millionrounds.com/workflows) · [Money admin](https://millionrounds.com/workflows?category=Money+admin#library)

# Invoice overdue reminder system - delivered with Airtable

Started by another system calling it, and works across Airtable, Email and Twilio. 21 steps, 6 branches: large, and worth reading before you trust it with anything live.

Large

[Download free](https://millionrounds.com/login?next=%2Fapp%2Fworkflow%2Finvoice-overdue-reminder-system-delivered-with-airtable)

**21 steps** Large: read it before trusting it with anything live

**6** Branches: places the flow splits

**0** Loops or waits

**3** Services it connects to

## The flow

Starts it 2 Logic 11 Service 8

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

- 1 **Daily 8AM** Schedule trigger *Starts it*
- 2 **Webhook** Webhook *Starts it*
- 3 **Fetch Overdue Invoices** Airtable *Service*
- 4 **Has Invoices?** If *Logic*
- 5 **Calculate Overdue** Code *Logic*
- 6 **Should Send?** If *Logic*
- 7 **Needs Payment Link?** If *Logic*
- 8 **Create Stripe Link** Http Request *Service*
- 9 **Merge Link** Set *Logic*
- 10 **Save Stripe Link** Airtable *Service*
- 11 **Send Email?** If *Logic*
- 12 **Build Email Template** Code *Logic*
- 13 **Send Email** Email Send *Service*
- 14 **Send SMS?** If *Logic*
- 15 **Build SMS** Code *Logic*
- 16 **Merge Results** Merge *Logic*
- 17 **Send SMS** Twilio *Service*
- 18 **Update Invoice Record** Airtable *Service*
- 19 **Needs Escalation?** If *Logic*
- 20 **Log Reminder** Airtable *Service*
- 21 **Slack Escalation** Http Request *Service*

## How it's built

- **Starts on:** Another system calling it
- **Steps:** 21, with 6 branches
- **Size:** Large: read it before trusting it with anything live
- **Connects to:** Airtable, Email, Twilio
- **Model:** None. This is plumbing, not judgement

## Questions

What does it need to run?

An n8n account, plus your own Airtable, Email and Twilio 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?

Take your time. At 21 steps it is large: read it before trusting it with anything live.

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 21 steps before you point it at anything that matters.

## Run it in n8n

- **Create your n8n account** Free to start. n8n is where the workflow runs. [Create an n8n account ↗](https://millionrounds.com/n8n)
- **Download the workflow** Free with a Millionrounds account. [Download free](https://millionrounds.com/login?next=%2Fapp%2Fworkflow%2Finvoice-overdue-reminder-system-delivered-with-airtable)
- **Paste it into n8n** Open a new workflow in n8n and paste. Then connect your own accounts.

Stored with the author's traces removed: canvas notes, instance identifiers, saved credential names and any live document they had left behind.

## Connects to

Each opens the other workflows that use it.

[Airtable](https://millionrounds.com/workflows?service=Airtable#library)[Email](https://millionrounds.com/workflows?service=Email#library)[Twilio](https://millionrounds.com/workflows?service=Twilio#library)

## Workflows like it

Also money admin, with the same services where possible, closest in size first.

- [**Track MPESA and Airtel mobile payments** 21 steps · calls a model · Twilio, n8n data table](https://millionrounds.com/workflow/track-mpesa-and-airtel-mobile-payments)
- [**Chase unanswered quotes by SMS with Twilio** 20 steps · Twilio](https://millionrounds.com/workflow/chase-unanswered-quotes-by-sms-with-twilio)
- [**Deliver photography galleries after payment with Razorpay** 20 steps · Airtable, Gmail](https://millionrounds.com/workflow/deliver-photography-galleries-after-payment-with-razorpay)
- [**Validate incoming XRechnung invoices from IMAP and archive them** 20 steps · Email, n8n data table](https://millionrounds.com/workflow/validate-incoming-xrechnung-invoices-from-imap-and-archive-t)
- [**Automate payment gateway & database transaction reconciliation** 19 steps · Email, Google Sheets](https://millionrounds.com/workflow/automate-payment-gateway-and-database-transaction-reconcilia)
- [**Monitor bank transactions with Google Sheets and Slack** 19 steps · Email, Google Sheets](https://millionrounds.com/workflow/monitor-bank-transactions-with-google-sheets-and-slack)