Automated invoice workflow with smart reminders using GPT-4, Stripe, and Google Workspace
Ready for 3.0Ready for 3.0. This template uses no nodes that n8n 3.0 removes. No removed nodes, versions or helpers found. Static check, last run 2026-10-19.
What this workflow does
This AI workflow has 11 nodes and runs on Google Sheets events. Along the way it connects Google Sheets, Google Docs, OpenAI and Gmail and 1 more.
How it runs
Trigger: On Google Sheets events.
- AI Invoice Content Generation (OpenAI): uses OpenAI
- Create Invoice from Template (Google Docs): uses Google Docs
- Send Invoice (Gmail): uses Gmail
- Until 3 Days Before Due Date (Wait): pauses before continuing
- Check Payment Status (HTTP Request): calls an HTTP API
- Is Paid? (If): checks a condition and branches into true / false
- Pre-Due Reminder (Gmail): uses Gmail
- Update Status (Google Sheets): uses Google Sheets
- Until 2 Days After Due Date (Wait): pauses before continuing
- Overdue Alert (Slack): uses Slack
Services it uses
Before you upgrade to n8n 3.0
Nothing in this workflow is removed in n8n 3.0, so it should import and run after the upgrade.
Nodes used (9)
- Google Sheets Trigger
n8n-nodes-base.googleSheetsTrigger - Google Docs
n8n-nodes-base.googleDocs - OpenAI
@n8n/n8n-nodes-langchain.openAi - Gmail
n8n-nodes-base.gmail - Wait
n8n-nodes-base.wait - HTTP Request
n8n-nodes-base.httpRequest - If
n8n-nodes-base.if - Slack
n8n-nodes-base.slack - Google Sheets
n8n-nodes-base.googleSheets
From the author
How It Works ⚙️ This workflow is a sophisticated, end-to-end solution that automates the entire billing lifecycle, from invoice creation to intelligent payment reminders and status tracking. It's designed to give you complete control over your cash flow…