Workflow Preview
Preview the automation flow before importing the JSON into n8n.
8 Nodes
JSON
May 18 2026
Google Drive Trigger
Trigger
Download File
Step 2
Mistral OCR
Step 3
OpenAI GPT-4o-mini
Step 4
Structured Output Parser
Step 5
If Duplicate
Step 6
Google Sheets
Step 7
Slack Alert
Output
Ready to automate?
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n8n Nodes Used
Who is this best for?
Finance, operations, and bookkeeping teams that need to process supplier invoices without manually copying totals, dates, and vendor information.
Überblick
This workflow watches a Drive folder for new invoices, extracts text with OCR, asks GPT-4o-mini to normalize invoice fields, checks duplicates, and writes the final ledger row to Google Sheets.
How it Works
- Watch a Google Drive folder for newly uploaded invoice PDFs.
- Run OCR and extract raw invoice text with page-level context.
- Normalize invoice number, vendor, due date, currency, tax, and line totals.
- Check whether the invoice already exists in the ledger.
- Append clean data to Google Sheets and send a Slack notification.
Inputs and Outputs
Required Inputs
- Invoice PDF
- Drive folder ID
- Ledger sheet ID
Workflow Outputs
- Clean invoice ledger row
- Duplicate warning
- Slack processing summary