Auto-Invoice System for n8n — Form → Branded Invoice → Email + Register

Turn a simple form into a professional invoice, automatically. Your staff enters the customer, service, and price; the workflow builds a clean branded invoice, emails it to the customer, logs it to a Google Sheet, and assigns a sequential invoice number. Includes an optional SST tax toggle and a "How to pay" block.Included: importable n8n workflow (JSON) + step-by-step setup guide (SMTP + Google service account) + a one-block config.You'll need: your own n8n instance, an email (SMTP/Gmail), and a Google service account — all free-tier friendly. ~15-minute setup, no coding beyond editing one config block

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