Log Gmail invoice emails to data tables with Claude Haiku

by Invara ✓ · 11 views · created 2026-07-20 · Invoice Processing, AI Summarization

What this workflow does

This workflow has 7 nodes and runs on a schedule (cron 45 6 * * *). Along the way it connects Gmail. It also calls api.anthropic.com over HTTP.

How it runs

Trigger: On a schedule (cron 45 6 * * *).

1. Fetch Invoices from Gmail (Gmail): get many (message)
2. Create Extraction Prompt (Code): runs custom JavaScript code
3. Post to Claude API (HTTP Request): calls api.anthropic.com (POST)
4. Validate Extracted Data (Code): runs custom JavaScript code
5. Add Invoices to Table (Data table): insert (row)
6. Mark Email as Processed (Gmail): add labels (message)

Services it uses

Gmail

HTTP calls to: api.anthropic.com

Before you upgrade to n8n 3.0

Nodes used (5)

• Schedule Triggern8n-nodes-base.scheduleTrigger
• Gmailn8n-nodes-base.gmail
• Coden8n-nodes-base.code
• HTTP Requestn8n-nodes-base.httpRequest
• Data tablen8n-nodes-base.dataTable

From the author

Quick overview This workflow runs every morning to find unprocessed invoice-like emails in Gmail, uses Anthropic Claude to extract vendor, total amount, currency, date, and description, then logs each validated invoice into an n8n Data Table and labels the…

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