Automated Overdue Invoice Reminder System

This workflow automates invoice payment reminders by triggering on new or updated rows in a Google Sheets spreadsheet containing invoice data, such as due dates in column D. It fetches the current date, calculates the number of overdue days using a date helper, and employs a router to direct the flow based on overdue thresholds: polite reminders after 7 days, firmer notices at 14 days, and urgent demands at 21 days. Emails are customized with increasing urgency to prompt payment without manual intervention.

Key benefits include significant time savings for accounts receivable teams, reduced overdue accounts, and professional, consistent communication that minimizes awkward follow-ups. It prevents revenue leakage by proactively chasing payments, improving cash flow for businesses.

Ideal use cases span real estate agencies tracking property listing fees, freelancers managing client invoices, or any service-based business using spreadsheets for billing. Easily adaptable to Stripe or other sources for production use, it scales for high-volume invoicing while maintaining compliance with standard reminder cadences.