# Extract and process invoices with OpenAI and Google Drive: n8n workflow

> Started by an event in a connected app, and works across Google Drive and Google Sheets. It puts OpenAI behind a retrieval step, so answers are drawn from...

Source: https://millionrounds.com/workflow/extract-and-process-invoices-with-openai-and-google-drive (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)

# Extract and process invoices with OpenAI and Google Drive

Started by an event in a connected app, and works across Google Drive and Google Sheets. It puts OpenAI behind a retrieval step, so answers are drawn from documents you supply rather than from the model alone. 12 steps: a working afternoon to understand properly.

Medium Calls a model: OpenAI Retrieval

[Download free](https://millionrounds.com/login?next=%2Fapp%2Fworkflow%2Fextract-and-process-invoices-with-openai-and-google-drive)

**12 steps** Medium: a working afternoon

**0** Branches: places the flow splits

**0** Loops or waits

**2** Services it connects to

## The flow

Starts it 1 Model 4 Logic 1 Service 6

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

- 1 **Chart of Accounts** Google Sheets Tool *Service*
- 2 **Structured Output Parser** Output Parser Structured *Model*
- 3 **OpenAI Chat Model** Lm Chat Open Ai *Model*
- 4 **Simple Memory** Memory Buffer Window *Model*
- 5 **Google Drive Trigger** Google Drive trigger *Starts it*
- 6 **Invoice Agent** Agent *Model*
- 7 **Download file** Google Drive *Service*
- 8 **Update Booking List** Google Sheets *Service*
- 9 **Edit Fields** Set *Logic*
- 10 **Extract from File** Extract From File *Service*
- 11 **Move file** Google Drive *Service*
- 12 **Save to Drive** Google Drive *Service*

## How it's built

- **Starts on:** An event in a connected app
- **Steps:** 12
- **Size:** Medium: a working afternoon
- **Connects to:** Google Drive, Google Sheets
- **Model:** OpenAI
- **Retrieval:** Answers are drawn from documents you supply, not from the model alone

## Questions

What does it need to run?

An n8n account, plus your own Google Drive and Google Sheets accounts, and a key for OpenAI. You connect your own accounts after importing it; none are included.

What starts it?

It starts on an event in a connected app.

Does it use AI?

Yes. It calls OpenAI. Its answers draw on documents you give it, not on the model alone. Model calls are billed by the provider, not by n8n.

How long does it take to set up?

Plan an afternoon. 12 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 12 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%2Fextract-and-process-invoices-with-openai-and-google-drive)
- **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.

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

## Workflows like it

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

- [**AI auto-save Gmail receipts to Google Sheets + Google Drive** 12 steps · calls a model · Gmail, Google Drive](https://millionrounds.com/workflow/ai-auto-save-gmail-receipts-to-google-sheets-google-drive)
- [**AI business proposal generator with Gemini and Google Drive** 12 steps · calls a model · Google Drive, Google Sheets](https://millionrounds.com/workflow/ai-business-proposal-generator-with-gemini-and-google-drive)
- [**Automate employee trip expense processing with Jotform** 12 steps · calls a model · Gmail, Google Drive](https://millionrounds.com/workflow/automate-employee-trip-expense-processing-with-jotform)
- [**Automate invoice processing & stock management with Gmail** 12 steps · calls a model · Gmail, Google Sheets](https://millionrounds.com/workflow/automate-invoice-processing-and-stock-management-with-gmail)
- [**Automated Invoice Flow Manager with OpenAI and Gmail** 12 steps · calls a model · Gmail, Google Sheets](https://millionrounds.com/workflow/automated-invoice-flow-manager-with-openai-and-gmail)
- [**Automated trip expense claim form with OpenAI and Google Drive** 12 steps · calls a model · Email, Google Drive](https://millionrounds.com/workflow/automated-trip-expense-claim-form-with-openai-and-google-dri)