Descriptions:
This video walks through building a fully automated invoice and receipt processing agent in n8n, triggered via WhatsApp through Twilio. The workflow handles both image and PDF inputs, routing them through the Mistral AI node for OCR and data extraction before writing structured records to a backend database built with four NocoDB tables: runs, invoices, users, and policies.
A standout feature is the policy-based approval engine: each invoice category carries a spending threshold (for example, meal receipts under $75 are auto-approved), and the workflow checks extracted totals against those rules in real time. The video also covers a practical file-size workaround—routing high-resolution smartphone photos through Google Drive before Mistral AI processing reduces file size and prevents parsing errors.
Viewers will learn how to set up Twilio as a WhatsApp gateway, validate users against an allowlist table, branch logic based on file extension (JPG/PNG vs PDF), and log every workflow execution for auditability. The channel host Bart Slodyczka explains how the same webhook entry point could be swapped for native WhatsApp, Telegram, or other messaging nodes with minimal changes, making the pattern reusable across different communication channels.
📺 Source: Bart Slodyczka · Published January 10, 2026
🏷️ Format: Hands On Build
