You finished the job and sent the invoice. A week goes by, then two, and the money still is not in your account. Most of the time the customer is not refusing to pay. They set it aside, you got busy, and nobody picked it back up.

This workflow reads your invoice sheet every morning and does the chasing for you. At 7 days past due it sends a polite SMS and email with the amount owed and a direct link to pay. At 14 days it sends a firmer second notice. The moment you mark an invoice paid in the sheet, it skips that one on every future run.

Included: the n8n workflow JSON, a step-by-step setup guide, and a limb spec for teams running an automation runtime. Setup takes about 30 minutes. Connects to Google Sheets for invoice data, Twilio for SMS, and Gmail for email. Every message template is plain text and fully editable before you turn it on.