{"product_id":"n8n-invoice-reminder-escalation-workflow-google-sheets-gmail","title":"n8n Invoice Reminder \u0026 Escalation Workflow (Google Sheets + Gmail)","description":"\u003ch3\u003eAutomatically remind customers for unpaid invoices—and escalate to finance when it’s time\u003c\/h3\u003e\n\u003cp\u003eThis \u003cstrong\u003en8n Invoice Reminder \u0026amp; Escalation Workflow\u003c\/strong\u003e reads invoice data from \u003cstrong\u003eGoogle Sheets\u003c\/strong\u003e, checks prior reminder history, and sends timely follow-up emails through \u003cstrong\u003eGmail\u003c\/strong\u003e—with safe \u003cstrong\u003etest mode\u003c\/strong\u003e enabled by default. It also records every decision back into your Google Sheets for a complete audit trail.\u003c\/p\u003e\n\n\u003ch3\u003eWhat this workflow does\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSchedules and configuration:\u003c\/strong\u003e Runs manually or on weekdays at \u003cstrong\u003e09:00\u003c\/strong\u003e, loading a configuration that enforces \u003cstrong\u003esafe test mode\u003c\/strong\u003e unless live sending is explicitly approved.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMerges invoice + reminder history:\u003c\/strong\u003e Reads the \u003cstrong\u003eInvoices\u003c\/strong\u003e and \u003cstrong\u003eReminder Log\u003c\/strong\u003e sheets and combines them so each invoice is evaluated against past reminder activity.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eValidates and calculates next action:\u003c\/strong\u003e Checks invoice fields (invoice IDs, due dates, amounts, currencies, statuses, and email fields) and computes the follow-up stage (e.g., due soon, overdue, or escalate) using \u003cstrong\u003esnooze\u003c\/strong\u003e and \u003cstrong\u003eminimum-interval\u003c\/strong\u003e rules.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIdempotency protection:\u003c\/strong\u003e Uses an \u003cstrong\u003eInvoiceID + stage + date\u003c\/strong\u003e key in the Reminder Log to skip reminders that were already reserved or processed.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRoutes actions:\u003c\/strong\u003e Sends customer reminders, triggers a finance escalation path, or records exceptions\/holds when data issues are detected (without sending email).\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReserves, then sends, then audits:\u003c\/strong\u003e Appends a \u003cstrong\u003e“RESERVED”\u003c\/strong\u003e entry to the Reminder Log, sends the Gmail message (to a \u003cstrong\u003etest inbox\u003c\/strong\u003e unless live sending is enabled), and writes the final outcome (sent, escalated, skipped, hold, or data error) with the reason and idempotency key.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eUse cases\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eSend automated invoice reminders on a predictable weekday cadence while preventing duplicate emails.\u003c\/li\u003e\n  \u003cli\u003eEscalate overdue invoices to finance after reminder intervals are exhausted.\u003c\/li\u003e\n  \u003cli\u003eMaintain a trustworthy audit trail of every decision in Google Sheets for ops and compliance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical details\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIntegrations \/ nodes:\u003c\/strong\u003e \u003cstrong\u003eCode\u003c\/strong\u003e, \u003cstrong\u003eGmail\u003c\/strong\u003e, \u003cstrong\u003eMerge\u003c\/strong\u003e, \u003cstrong\u003eSwitch\u003c\/strong\u003e, \u003cstrong\u003eSticky Note\u003c\/strong\u003e, and \u003cstrong\u003eGoogle Sheets\u003c\/strong\u003e.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCore logic:\u003c\/strong\u003e weekday scheduling, data validation, stage computation, idempotency via Reminder Log keys, RESERVERD reservation entries, and audit logging back to Google Sheets.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"N8N Commerce","offers":[{"title":"Default Title","offer_id":46359770300595,"sku":"N8N-22171","price":17.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0749\/6279\/6723\/files\/dbuJCuR3iX2cjZC2bszd4_TsYPqFf8.png?v=1793697323","url":"https:\/\/buyflowscripts.com\/products\/n8n-invoice-reminder-escalation-workflow-google-sheets-gmail","provider":"N8N Commerce","version":"1.0","type":"link"}