# Approve vendor invoices from Gmail using Claude, Google Sheets, Slack and QuickBooks

> Quick overview Turn vendor invoices from Gmail into approved QuickBooks bills. Claude reads each PDF, code checks it against your vendors, POs, log and QuickBooks, Slack approvers decide, and every outcome is logged, labelled and followed up. How it works 1. A Gmail trigger catches each email with a PDF and calls this workflow once per email, so every invoice runs and waits for approval on its own. 2. The PDF is saved to a Google Drive folder, then one Anthropic API call reads it and returns vendor, invoice number, dates, amounts, PO number, bank details and line items as fixed JSON. 3. It reads your Vendors, Purchase orders and Invoice log tabs and searches QuickBooks Online for a bill with the same number. Code checks the vendor, sender domain, bank details, arithmetic, open PO balance and duplicates, then picks auto-approve, approve or hold. 4. Small, clean, PO-matched invoices approve themselves. Others go to a Slack approver by direct message with a time limit, plus a second appro

- **Domain**: `n8n-workflow-20234.n8n.io`
- **Provider**: n8n.io (https://n8n.io)
- **Kind**: workflow
- **Category**: verification
- **Live-responds (last probe)**: None
- **Signed card**: False
- **Streaming**: False
- **Quality score**: 40%

## URLs
- Agent card: https://n8n.io/workflows/20234
- Page (HTML): https://agenstry.com/agents/n8n-workflow-20234.n8n.io
- Documentation: https://n8n.io/workflows/20234