# Extract and validate Gmail invoice PDFs into Google Sheets: n8n workflow

> Started by an arriving email, and works across Gmail and Google Sheets. It hands the judgement calls to OpenAI.

Source: https://millionrounds.com/workflow/extract-and-validate-gmail-invoice-pdfs-into-google-sheets (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 validate Gmail invoice PDFs into Google Sheets

Started by an arriving email, and works across Gmail and Google Sheets. It hands the judgement calls to OpenAI. 9 steps, 1 branch: a working afternoon to understand properly.

Medium Calls a model: OpenAI

[Download free](https://millionrounds.com/login?next=%2Fapp%2Fworkflow%2Fextract-and-validate-gmail-invoice-pdfs-into-google-sheets)

**9 steps** Medium: a working afternoon

**1** Branch: places the flow splits

**0** Loops or waits

**2** Services it connects to

## The flow

Starts it 1 Model 2 Logic 3 Service 3

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

- 1 **New Invoice Email** Gmail trigger *Starts it*
- 2 **Extraction Model** Lm Chat Open Ai *Model*
- 3 **Only PDF Attachments** Filter *Logic*
- 4 **Read The Invoice** Information Extractor *Model*
- 5 **PDF To Text** Extract From File *Service*
- 6 **Validate Before Booking** Code *Logic*
- 7 **Did It Reconcile?** If *Logic*
- 8 **Append To Books** Google Sheets *Service*
- 9 **Send To Exceptions Queue** Google Sheets *Service*

## How it's built

- **Starts on:** An arriving email
- **Steps:** 9, with 1 branch
- **Size:** Medium: a working afternoon
- **Connects to:** Gmail, Google Sheets
- **Model:** OpenAI

## Questions

What does it need to run?

An n8n account, plus your own Gmail 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 arriving email.

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?

Plan an afternoon. 9 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 9 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-validate-gmail-invoice-pdfs-into-google-sheets)
- **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)[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.

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- [**AI premium proposal generator with OpenAI and Google Slides** 9 steps · calls a model · Gmail, Google Drive](https://millionrounds.com/workflow/ai-premium-proposal-generator-with-openai-and-google-slides)
- [**Classify Gmail invoice attachments with Gemini** 9 steps · calls a model · Gmail](https://millionrounds.com/workflow/classify-gmail-invoice-attachments-with-gemini)
- [**Create and send AI sales proposals with Gemini and Google Docs** 9 steps · calls a model · Gmail, Google Docs](https://millionrounds.com/workflow/create-and-send-ai-sales-proposals-with-gemini-and-google-do)
- [**Extract invoice data from email to Google Sheets with OpenAI** 9 steps · calls a model · Gmail, Google Drive](https://millionrounds.com/workflow/extract-invoice-data-from-email-to-google-sheets-with-openai)
- [**Generate sales call proposals with OpenAI and Google Slides** 9 steps · calls a model · Gmail, Google Drive](https://millionrounds.com/workflow/generate-sales-call-proposals-with-openai-and-google-slides)