Track and classify expenses with Mindee OCR, GPT-4o, PostgreSQL and Google Drive

by WeblineIndia ✓ · 2 views · created 2026-09-03 · Document Extraction, AI Summarization

What this workflow does

This AI workflow has 32 nodes and runs when someone submits an n8n form (“Expense Upload”) (plus 1 other trigger). Along the way it connects Slack, OpenAI, Google Drive and Postgres. It also calls api-v2.mindee.net over HTTP.

How it runs

Trigger: When someone submits an n8n form (“Expense Upload”) (plus 1 other trigger).

1. Validate Receipt File (Code): runs custom JavaScript code
2. Calculate Monthly Spending (Postgres): run a query
3. Generate Category Analytics (Postgres): run a query
4. Generate Merchant Analytics (Postgres): run a query
5. Calculate Expense Split (Postgres): run a query
6. Submit Receipt To Mindee (HTTP Request): calls api-v2.mindee.net (POST)
7. Upload Receipt To Drive (Google Drive): uses Google Drive
8. Merge: merges the data from its input branches
9. Validate OCR Job (If): checks a condition and branches into true / false
10. OCR Failure Alert (Slack): uses Slack

…plus 20 more steps. See the full node list below.

Services it uses

SlackOpenAIGoogle DrivePostgres

HTTP calls to: api-v2.mindee.net

Before you upgrade to n8n 3.0

Nodes used (12)

• n8n Form Triggern8n-nodes-base.formTrigger
• Coden8n-nodes-base.code
• HTTP Requestn8n-nodes-base.httpRequest
• Ifn8n-nodes-base.if
• Slackn8n-nodes-base.slack
• Stop and Errorn8n-nodes-base.stopAndError
• Waitn8n-nodes-base.wait
• OpenAI@n8n/n8n-nodes-langchain.openAi
• Mergen8n-nodes-base.merge
• Google Driven8n-nodes-base.googleDrive
• Postgresn8n-nodes-base.postgres
• Schedule Triggern8n-nodes-base.scheduleTrigger

From the author

Quick overview This workflow collects receipt uploads via an n8n form, extracts expense details with Mindee OCR, enriches and classifies the expense using OpenAI, stores the receipt in Google Drive, saves the final record to PostgreSQL, and sends Slack alerts…

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