Automate invoices, payments, and refunds
A published walkthrough shows the setup was a single n8n workflow triggered by a webhook, with API-key validation up front and separate routes for invoice, payment, and refund events. It used Google Sheets for records, PDFbro to create invoice PDFs, Google Drive to store them, and Resend to send emails; before each path ran, it checked for duplicates, then updated statuses, links, balances, and timestamps after processing. The result was an end-to-end flow that kept invoice, payment, and refund handling in one orchestration layer while preventing duplicate records and duplicate notifications.
- Agent or tool
- n8n
- Topic
- Automation
- Reported on
- Added
- 2026-10-15
Why it matters
Automation used to mean wiring up rigid rules. Agents can handle the messy, in-between steps that rules miss, which makes many more workflows worth automating. It is one of 19 sightings filed under Automation on Agent Sightings (number 8 by interest), and one of 36 involving n8n.
How you could try it
Here is a reusable prompt, written by us in our own words, that captures the task. Paste it into n8n or any similar agent and adjust the details to your situation.
Automation design: automate invoices, payments, and refunds. Specify triggers, steps, and failure modes before enabling sends or deletes.
Tip: Start small: run it once on a low-stakes example, read what the agent did, and only then let it run on real work.
Source
Read the original first-hand account on Reddit: https://www.reddit.com/r/n8n/comments/1wakr0s/n8n_workflow_that_handles_invoice…. Our summary is a paraphrase; details are in the source.