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Catch duplicate invoices before you pay them twice

An AI-powered workflow that runs after invoice entry but before approval, catching duplicates that simple matching rules miss.

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1-2%

of AP spend lost to duplicate payments

Months

before most duplicates surface in audits

10 sec

to review with AI reasoning attached

Source: APQC Accounts Payable Benchmarks

What's included

A production-ready n8n workflow you can import and configure in minutes.

AI-powered fuzzy matching

Catches duplicates even when invoice numbers and descriptions differ. The AI reads line items and recognizes when two invoices describe the same work.

Configurable thresholds

Set your own amount tolerance, date lookback window, and confidence thresholds. Tune based on your AP volume.

PO balance verification

Checks purchase order remaining balances. If a PO is fully invoiced and a new invoice references it, that's a strong duplicate signal.

Slack escalation with reasoning

High-confidence matches alert your Controller with both invoices side by side and the AI's reasoning. Ten-second decision instead of a manual investigation.

n8n workflow canvas showing the duplicate payment detection workflow with 18 nodes

The full workflow in n8n. 18 nodes covering exact match, fuzzy match, and escalation.

Download the workflow

Get the n8n workflow JSON with matching rules, thresholds, and escalation logic.

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Watch the full build

5 minute walkthrough: workflow architecture, a live demo catching a $14,200 fuzzy duplicate, and the AI reasoning output.

Common Questions

What format is the workflow in?
An n8n workflow JSON file. Import it directly into n8n with one click. The same detection logic works in any workflow tool that can call APIs, but this template is built for n8n.
Do I need an OpenAI API key?
Yes, the fuzzy matching step uses an LLM to compare invoice descriptions. It's configured for OpenAI but works with any LLM provider n8n supports. Most invoices are filtered by the database pre-check and never hit the LLM, so API costs are minimal.
Can you build this for my company?
Yes. Book a free call and I'll assess your AP workflow, identify where duplicates are slipping through, and scope what implementation looks like for your specific ERP and team.

Want this built for your team?

Book a free call. I'll look at your current AP workflow, tell you exactly where duplicates are slipping through, and you'll walk away with a clear picture of what this looks like for your company.

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