Process invoices from Gmail and Drive using Google Gemini, Slack, and Sheets

by Muhammad Hammad ✓ · 54 views · created 2026-09-23 · Invoice Processing, AI Summarization

What this workflow does

This AI workflow has 31 nodes and runs on Gmail events (plus 2 other triggers). Along the way it connects Gmail, Google Drive, Google Gemini and Slack and 1 more.

How it runs

Trigger: On Gmail events (plus 2 other triggers).

1. Email Attachment Is PDF or Image? (If): checks a condition and branches into true / false
2. Download Drive File (Google Drive): download
3. Alert Workflow Failure (Slack): uses Slack
4. Extract Invoice Data (Email) (Google Gemini): work with document
5. Mark Unsupported Email As Read (Gmail): mark as read
6. Drive File Is PDF or Image? (If): checks a condition and branches into true / false
7. Tag Source Email (Edit Fields (Set)): sets 1 field: source
8. Notify Unsupported File Type (Slack): uses Slack
9. Extract Invoice Data (Drive) (Google Gemini): work with document
10. Combine Extraction Results (Merge): merges the data from its input branches

…plus 18 more steps. See the full node list below.

Services it uses

GmailGoogle DriveGoogle GeminiSlackGoogle Sheets

Before you upgrade to n8n 3.0

Nodes used (12)

• Gmail Triggern8n-nodes-base.gmailTrigger
• Google Drive Triggern8n-nodes-base.googleDriveTrigger
• Error Triggern8n-nodes-base.errorTrigger
• Google Driven8n-nodes-base.googleDrive
• Ifn8n-nodes-base.if
• Google Gemini@n8n/n8n-nodes-langchain.googleGemini
• Edit Fields (Set)n8n-nodes-base.set
• Slackn8n-nodes-base.slack
• Gmailn8n-nodes-base.gmail
• Mergen8n-nodes-base.merge
• Coden8n-nodes-base.code
• Google Sheetsn8n-nodes-base.googleSheets

From the author

Quick overview This workflow monitors Gmail and a Google Drive folder for new invoice/receipt files, uses Google Gemini to extract structured invoice data and classify expense categories, logs results to Google Sheets, and routes higher-value invoices to…

View the original on n8n.io → Check your own copy