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Detect duplicate invoices and pause risky approvals in n8n

At a glance

This n8n template extracts invoice PDFs with GPT-4o, checks invoice numbers and totals, assesses category and risk, and uses a wait-and-resume approval path before recording the final status. This workflow is listed under builder, n8n, invoice-validation, duplicate-detection, approval-workflow, template.

Agents / tools
n8n, OpenAI GPT-4o, Google Sheets, Gmail

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Prompt excerpt

Import the template, map a test Invoices Sheet, and connect OpenAI and test Gmail credentials. Configure your approval thresholds and resume endpoint. Submit a valid invoice, a duplicate, and an invoice whose tax does not reconcile; inspect routing and approval status before allowing production notifications or automatic approvals.
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