Chasing overdue invoices meant sending reminders manually and constantly checking replies to know who had already responded — reminders kept going out even after a client had replied, and the founder got pinged for every minor reply.
We built an n8n system that runs daily overdue-invoice reminders from a central AR sheet, then layered in a reply-detection agent that reads any client reply, classifies intent (paying soon, disputing, angry, already paid, and so on), and automatically pauses reminders for the right number of days — only escalating to a team alert when the reply genuinely needs a human (disputes, anger or payment claims).
What we did
Here's how we approached An accounting & bookkeeping firm's project, step by step.
Daily automated overdue-invoice reminder sequence from a central AR sheet
AI reply classifier detects intent, promised payment date and urgency
Auto-pause logic — reminders resume automatically once the pause window ends
Team alerts fire only for disputes, anger or already-paid claims, not routine replies
Full reply log with AI-generated summaries for every invoice
Results & impact
- Reminders no longer sent to clients who have already responded
- Founder and team only interrupted for replies that truly need a human
- Manual invoice-chasing reduced to near zero
- Reusable pattern — adaptable to any recurring collections or follow-up workflow
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