Automated invoice verification from Gmail: AI with manu

This automation streamlines the processing of incoming invoices via email by combining AI analysis with human oversight. Built on n8n and Azure OpenAI, it scans Gmail messages with PDF attachments, determines if they are invoices using GPT-4.1, and acts accordingly—saving valid files and requesting manual review when uncertain.

## Who it´s for
- Accountants handling incoming invoices via email
- Finance assistants automating document workflows
- Small businesses reducing manual data entry
- Administrators integrating AI into document processing

## What the automation does
- Triggers on new Gmail messages with a PDF attachment and ´Invoice´ in the subject line
- Extracts text from the PDF using PDF parsing tools
- Sends extracted content to Azure GPT-4.1 to determine if it’s an invoice
- On confirmation, saves the file to a specified local directory (e.g., C:/Test/Invoices)
- On rejection or parsing error, sends a manual verification request via email
- Notifies the user of the outcome

## What´s included
- Ready-to-use n8n workflow
- Trigger and handler logic powered by LangChain
- Integrations with Gmail, Azure OpenAI, and local file system
- Basic textual guide for setup and adaptation

## Requirements for setup
- Gmail account with API access enabled
- Azure OpenAI access with GPT-4.1 model deployed
- Running and configured n8n instance
- Write permissions to the target local folder

## Benefits and outcomes
- Reduced time spent on initial invoice screening
- Minimized classification errors through AI validation
- Centralized storage of verified invoices
- Automatic alerts for problematic files
- Scalable solution for growing invoice volumes
- Lower employee workload via intelligent filtering

## Important: template only
Important: you are purchasing a ready-made automation workflow template only. Rollout into your infrastructure, connecting specific accounts and services, 1:1 setup help, custom adjustments for non-standard stacks and any consulting support are provided as a separate paid service at an individual rate. To discuss custom work or 1:1 help, contact via Telegram: @gleb923.