Automate Gmail Invoice Processing with Azure GPT-4.1 & Human Review
Monitors Gmail for invoice PDFs, extracts text, validates with Azure GPT-4.1, adds human verification for accuracy, saves files securely, and sends confirmations.
This n8n workflow automates invoice processing by monitoring Gmail for new emails from specified senders containing PDF attachments with subjects like 'Invoice'. It downloads the PDF, extracts readable text, and uses Azure OpenAI GPT-4.1 to analyze and verify if it's a valid invoice. If the AI confidence is low, it triggers a human-in-the-loop verification step, notifying a reviewer via email or Slack for approval.
Upon validation, invoices are saved to local storage with timestamped, structured filenames for easy organization. A confirmation email is sent to the original sender or internal team, ensuring transparency. This setup minimizes manual data entry, reduces errors, and streamlines accounts payable for businesses.
Ideal for small to medium businesses, freelancers, and automation teams handling regular invoices. Benefits include time savings on processing, AI-powered accuracy, secure local storage, and flexible human oversight. Requires self-hosted n8n with community nodes, Gmail, and Azure OpenAI access.
New buyers can create an account from the cart to unlock a controlled $10 first-purchase credit on eligible orders of $25+.
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How to import this workflow into n8n
- 1Purchase or download the workflow to get the n8n workflow JSON file.
- 2In your n8n instance, open Workflows and choose "Import from File" (or paste the JSON with Ctrl+V on the canvas).
- 3Open each node marked with a credential warning and connect your own accounts and API keys.
- 4Run the workflow once manually to verify the data flow, then toggle it to Active.
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