Intelligent invoice processing
Invoices are read, validated, and recorded on their own; people only approve exceptions.
The problem
Accounting types in dozens of PDF invoices a day by hand. VAT errors or mismatches against the purchase order are found late, at payment or month-end close.
The real flow in n8n
Captured from the editor. Click to enlarge.
Step by step
- 1Detects new emails with a PDF invoice.
- 2Converts the PDF to text.
- 3 IAAI: extracts supplier, tax ID, number, date, PO, subtotal, VAT, and total.
- 4Checks VAT is 19% and the totals add up.
- 5Matches it against the approved purchase order.
- 6Correct invoice: recorded, filed in Drive, and accounting is notified.
- 7Mismatched invoice: asks a person to approve and logs the decision.
Built and tested in self-hosted n8n, with Anthropic Claude. Sensitive decisions go through human approval.
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