# Handle retail payment failures with Slack and Supabase: n8n workflow

> Started by another system calling it, and works across Gmail, Slack and Supabase. 17 steps, 4 branches, 1 loop or waits: a working afternoon to understand...

Source: https://millionrounds.com/workflow/handle-retail-payment-failures-with-slack-and-supabase (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)

# Handle retail payment failures with Slack and Supabase

Started by another system calling it, and works across Gmail, Slack and Supabase. 17 steps, 4 branches, 1 loop or waits: a working afternoon to understand properly.

Medium

[Download free](https://millionrounds.com/login?next=%2Fapp%2Fworkflow%2Fhandle-retail-payment-failures-with-slack-and-supabase)

**17 steps** Medium: a working afternoon

**4** Branches: places the flow splits

**1** Loop or waits

**3** Services it connects to

## The flow

Starts it 1 Logic 11 Service 5

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

- 1 **Receive Payment Failure** Webhook *Starts it*
- 2 **Normalize Payment Data** Set *Logic*
- 3 **Identify Failure Type** Function *Logic*
- 4 **Route by Failure Type** If *Logic*
- 5 **Notify Team: Payment Failed** Slack *Service*
- 6 **Is This a Fraudulent Payment?** If *Logic*
- 7 **Is This a High-Value Order?** If *Logic*
- 8 **Notify Team: Fraud Detected** Slack *Service*
- 9 **Notify Team: Payment Failure** Slack *Service*
- 10 **Notify Customer to Retry Payment** Gmail *Service*
- 11 **Log Fraud Case** Set *Logic*
- 12 **Log Hard Failure Case** Set *Logic*
- 13 **Wait Before Next Retry Attempt** Wait *Logic*
- 14 **Save Payment Failure Record** Supabase *Service*
- 15 **Increase Retry Attempt Count** Set *Logic*
- 16 **Has Retry Limit Been Reached?** If *Logic*
- 17 **Log Retry Attempt Result** Set *Logic*

## How it's built

- **Starts on:** Another system calling it
- **Steps:** 17, with 4 branches, 1 loop or waits
- **Size:** Medium: a working afternoon
- **Connects to:** Gmail, Slack, Supabase
- **Model:** None. This is plumbing, not judgement

## Questions

What does it need to run?

An n8n account, plus your own Gmail, Slack and Supabase 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. 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.

## 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%2Fhandle-retail-payment-failures-with-slack-and-supabase)
- **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.

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

## Workflows like it

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

- [**An workflow that processes receipts from images.** 17 steps · Google Drive, Google Sheets](https://millionrounds.com/workflow/an-workflow-that-processes-receipts-from-images)
- [**Fast-track expense reimbursements with UploadToURL** 17 steps · Gmail, Google Sheets](https://millionrounds.com/workflow/fast-track-expense-reimbursements-with-uploadtourl)
- [**Route multi-step expense approvals with Gmail and HTTP API** 17 steps · Gmail](https://millionrounds.com/workflow/route-multi-step-expense-approvals-with-gmail-and-http-api)
- [**Send Mercado Pago billing links and reminders** 17 steps · Gmail, Google Sheets](https://millionrounds.com/workflow/send-mercado-pago-billing-links-and-reminders)
- [**Send invoice payment reminders with Gmail and Google Sheets** 17 steps · Gmail, Google Sheets](https://millionrounds.com/workflow/send-invoice-payment-reminders-with-gmail-and-google-sheets)
- [**Auto-extract & approve invoices with OpenAI and Jotform** 17 steps · calls a model · Gmail, Google Sheets](https://millionrounds.com/workflow/auto-extract-and-approve-invoices-with-openai-and-jotform)