Send Stripe invoice reminders with GPT-4.1-mini, Google Sheets and Slack

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Built by Hyrum Hurst Hyrum Hurst
Created on June 13, 2026

Description

Who this workflow is for
Accounting and bookkeeping firms needing automated invoice creation and payment reminders.

What this workflow does
AI generates personalized emails for overdue invoices, logs invoice info in Google Sheets, notifies accountants via Slack, creates PDF invoices, and schedules follow-ups.

How the workflow works
Invoice creation triggers workflow
AI drafts personalized email
Routes based on payment status
Logs invoice info in Google Sheets
Sends Slack notifications to accountant
Sends email to client
Generates PDF invoice
Schedules follow-up events
Optional CRM/accounting tool integration

Author: Hyrum Hurst, AI Automation Engineer
Company: QuarterSmart
Contact: [email protected]

Nodes Used (8)

AI Agent
@n8n/n8n-nodes-langchain.agent
Google Calendar
n8n-nodes-base.googleCalendar
Google Sheets
n8n-nodes-base.googleSheets
HTTP Request
n8n-nodes-base.httpRequest
OpenAI Chat Model
@n8n/n8n-nodes-langchain.lmChatOpenAi
Send Email
n8n-nodes-base.emailSend
Slack
n8n-nodes-base.slack
Structured Output Parser
@n8n/n8n-nodes-langchain.outputParserStructured