# Enterprise expense & invoice fraud detection with OpenAI: n8n workflow

> Started by another system calling it, and works across Email, Google Sheets and Slack. It hands the judgement calls to OpenAI.

Source: https://millionrounds.com/workflow/enterprise-expense-and-invoice-fraud-detection-with-openai (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)

# Enterprise expense & invoice fraud detection with OpenAI

Started by another system calling it, and works across Email, Google Sheets and Slack. It hands the judgement calls to OpenAI. 7 steps: small enough to read in one sitting and change without fear.

Small Calls a model: OpenAI

[Download free](https://millionrounds.com/login?next=%2Fapp%2Fworkflow%2Fenterprise-expense-and-invoice-fraud-detection-with-openai)

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

**0** Branches: places the flow splits

**0** Loops or waits

**3** Services it connects to

## The flow

Starts it 1 Model 1 Logic 1 Service 4

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

- 1 **Expense/Invoice Trigger** Webhook *Starts it*
- 2 **Fetch ERP Data** Http Request *Service*
- 3 **AI Fraud Analysis** Open Ai *Model*
- 4 **Flag Suspicious Claims** Function *Logic*
- 5 **Route to Audit Team** Email Send *Service*
- 6 **Log to Dashboard** Google Sheets *Service*
- 7 **Notify Finance** Slack *Service*

## How it's built

- **Starts on:** Another system calling it
- **Steps:** 7
- **Size:** Small: readable in one sitting
- **Connects to:** Email, Google Sheets, Slack
- **Model:** OpenAI

## Questions

What does it need to run?

An n8n account, plus your own Email, Google Sheets and Slack accounts, and a key for OpenAI. 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?

Yes. It calls OpenAI. Model calls are billed by the provider, not by n8n.

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%2Fenterprise-expense-and-invoice-fraud-detection-with-openai)
- **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.

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

## Workflows like it

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

- [**AI Receipt to Google Sheets Automation with Gemini and OpenAI** 7 steps · calls a model · Google Sheets](https://millionrounds.com/workflow/ai-receipt-to-google-sheets-automation-with-gemini-and-opena)
- [**AI-powered PDF invoice parser with Google Drive** 7 steps · calls a model · Google Drive, Google Sheets](https://millionrounds.com/workflow/ai-powered-pdf-invoice-parser-with-google-drive)
- [**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)
- [**Automated request-to-quote with OpenAI and Google Sheets** 7 steps · calls a model · Email, Google Sheets](https://millionrounds.com/workflow/automated-request-to-quote-with-openai-and-google-sheets)
- [**End-to-end sales proposal & handoff system with OpenAI** 7 steps · calls a model · Gmail, Google Drive](https://millionrounds.com/workflow/end-to-end-sales-proposal-and-handoff-system-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)