🔧 What I built:
Automated invoice reminder system in n8n
that reads a Google Sheet, sends Gmail reminders
to unpaid clients, and updates the sheet automatically.
📊 The result:
3 unpaid invoices → reminders sent + sheet updated
in one workflow run. Zero manual work.
🧠Biggest lesson:
"Column to match on" must be a unique ID —
cost me an hour. Won't forget it.
🔜 Tomorrow:
Escalating reminders — 4 email tones
based on how many days overdue.
Day 1 of building in public. 🚀
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