Example: Automated Invoice Processing
An n8n workflow that reads incoming invoice emails, extracts the data with an LLM, and files it — no manual entry.
- n8n
- LLM
- Automation
Problem
The finance inbox received dozens of invoices a week, each one keyed into a spreadsheet by hand. It was slow, boring, and error-prone.
What I built
I built an n8n workflow triggered by new emails. It pulls the PDF, sends it to an LLM to extract the vendor, amount, and due date, validates the fields, and appends a clean row to the accounting sheet — flagging anything low-confidence for a human to check.
Tech used
- n8n
- OpenRouter
- Google Sheets API
- Webhooks
Result
Cut manual invoice entry from ~3 hours a week to near zero, with a human-in-the-loop review only for edge cases.