Building an n8n AI Agent to Prepare Invoice Review Packets for Finance

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The article explains how to design an AI invoice processing agent in n8n that extracts and validates invoice data, flags duplicates, and assembles an approval packet. The agent is positioned as an evidence-gathering tool rather than an approver, so it never approves, pays, creates vendors, or changes bank details. Invoice content is treated as untrusted data, and any mismatch, low-confidence field, or bank-detail change is routed to a human. Totals, tax, duplicate, and purchase-order checks are handled deterministically, while payment release and vendor changes remain human-only processes. Records are written once with verified responses to avoid duplicate or inconsistent accounting entries.

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