# Send overdue invoice reminders from Pennylane to Slack: n8n workflow

> Started by a clock, and works across Slack. 7 steps, 1 branch: small enough to read in one sitting and change without fear.

Source: https://millionrounds.com/workflow/send-overdue-invoice-reminders-from-pennylane-to-slack (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)

# Send overdue invoice reminders from Pennylane to Slack

Started by a clock, and works across Slack. 7 steps, 1 branch: small enough to read in one sitting and change without fear.

Small

[Download free](https://millionrounds.com/login?next=%2Fapp%2Fworkflow%2Fsend-overdue-invoice-reminders-from-pennylane-to-slack)

**7 steps** Small: readable in one sitting

**1** Branch: places the flow splits

**0** Loops or waits

**1** Service it connects to

## The flow

Starts it 1 Logic 4 Service 2

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

- 1 **Schedule Trigger** Schedule trigger *Starts it*
- 2 **PL Fetch Invoices** Http Request *Service*
- 3 **Code Filter Overdue** Code *Logic*
- 4 **IF Has Overdue** If *Logic*
- 5 **Code Build Reminder** Code *Logic*
- 6 **Set Done** Set *Logic*
- 7 **SL Send Notification** Slack *Service*

## How it's built

- **Starts on:** A clock
- **Steps:** 7, with 1 branch
- **Size:** Small: readable in one sitting
- **Connects to:** Slack
- **Model:** None. This is plumbing, not judgement

## Questions

What does it need to run?

An n8n account, plus your own Slack account. You connect your own accounts after importing it; none are included.

What starts it?

It starts on a clock.

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?

Not long. At 7 steps it can be read in one sitting and changed without fear.

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 7 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%2Fsend-overdue-invoice-reminders-from-pennylane-to-slack)
- **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.

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

## Workflows like it

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

- [**Send weekly invoice summaries and overdue alerts** 7 steps · Gmail, Google Sheets](https://millionrounds.com/workflow/send-weekly-invoice-summaries-and-overdue-alerts)
- [**Track Pennylane invoice payment status with Slack** 7 steps · Slack](https://millionrounds.com/workflow/track-pennylane-invoice-payment-status-with-slack)
- [**Automate invoice OCR for Accounting Co with Drive and Gemini** 7 steps · calls a model · Google Drive, Google Sheets](https://millionrounds.com/workflow/automate-invoice-ocr-for-accounting-co-with-drive-and-gemini)
- [**Enterprise expense & invoice fraud detection with OpenAI** 7 steps · calls a model · Email, Google Sheets](https://millionrounds.com/workflow/enterprise-expense-and-invoice-fraud-detection-with-openai)
- [**Extract and log invoice data from Gmail with OpenAI** 7 steps · calls a model · Gmail, Google Sheets](https://millionrounds.com/workflow/extract-and-log-invoice-data-from-gmail-with-openai)
- [**Process invoice emails with Gmail and OpenAI** 7 steps · calls a model · Email, Gmail](https://millionrounds.com/workflow/process-invoice-emails-with-gmail-and-openai)