{"product_id":"postgresql-order-webhook-automation-gmail-slack-invoice-alerts","title":"PostgreSQL Order Webhook Automation: Gmail \u0026 Slack Invoice Alerts","description":"\u003ch3\u003eAutomatically turn paid order webhooks into PostgreSQL orders, Slack alerts, and Gmail invoice\/shipping emails\u003c\/h3\u003e\n\u003cp\u003eThis n8n workflow receives \u003cstrong\u003epayment webhook\u003c\/strong\u003e events, validates and stores orders in \u003cstrong\u003ePostgreSQL\u003c\/strong\u003e, notifies your \u003cstrong\u003eSlack\u003c\/strong\u003e warehouse team, generates \u003cstrong\u003ePDF invoices\u003c\/strong\u003e with \u003cstrong\u003ePDFMonkey\u003c\/strong\u003e, and emails customers with \u003cstrong\u003eGmail\u003c\/strong\u003e—including confirmation, shipping updates, and delayed delivery\/review follow-ups.\u003c\/p\u003e\n\n\u003ch3\u003eWhat this workflow does\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReceives a POST webhook\u003c\/strong\u003e for a paid order and validates required fields (order ID, amount, and customer email) for correct formatting.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNormalizes and stores order data\u003c\/strong\u003e by inserting the order into a PostgreSQL \u003cem\u003eorders\u003c\/em\u003e table and writing the payment event to an \u003cem\u003eorder_logs\u003c\/em\u003e table.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAlerts the warehouse via Slack\u003c\/strong\u003e as soon as the paid order is recorded.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCalculates invoice totals\u003c\/strong\u003e with an \u003cstrong\u003e18% tax\u003c\/strong\u003e, sends the invoice payload to \u003cstrong\u003ePDFMonkey\u003c\/strong\u003e, then checks the document status after a brief wait.\u003c\/li\u003e\n  \u003cli\u003eIf the PDF is generated successfully, \u003cstrong\u003eupdates PostgreSQL\u003c\/strong\u003e with the invoice URL, logs the invoice event, and \u003cstrong\u003eemails the customer\u003c\/strong\u003e an order confirmation with the invoice download link using \u003cstrong\u003eGmail\u003c\/strong\u003e.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCreates shipping details\u003c\/strong\u003e (tracking ID, courier name, estimated delivery), updates the order as shipped in PostgreSQL, logs the shipment event, and \u003cstrong\u003eemails a shipping notification\u003c\/strong\u003e to the customer via Gmail.\u003c\/li\u003e\n  \u003cli\u003eAfter a \u003cstrong\u003e3-day delay\u003c\/strong\u003e, marks the order as delivered in PostgreSQL, logs delivery, emails a delivery feedback request, waits 1 day, then emails a product review request.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGenerates a reward coupon code\u003c\/strong\u003e and sends the discount to the customer (as part of post-delivery follow-ups).\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePosts daily sales metrics to Slack\u003c\/strong\u003e.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eUse cases\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eTurn payment confirmations into \u003cstrong\u003einstant order capture\u003c\/strong\u003e in PostgreSQL with Slack team visibility.\u003c\/li\u003e\n  \u003cli\u003eSend customers automated \u003cstrong\u003einvoice, shipping, delivery feedback, and review\u003c\/strong\u003e emails—without manual coordination.\u003c\/li\u003e\n  \u003cli\u003eMaintain auditable order history using \u003cstrong\u003eorder_logs\u003c\/strong\u003e for each lifecycle stage.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical details\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNodes\/activities:\u003c\/strong\u003e webhook, if, set, wait, Gmail, Slack\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIntegrations:\u003c\/strong\u003e \u003cstrong\u003ePostgreSQL\u003c\/strong\u003e for orders + order_logs, \u003cstrong\u003ePDFMonkey\u003c\/strong\u003e for PDF invoice generation, \u003cstrong\u003eGmail\u003c\/strong\u003e for customer emails, \u003cstrong\u003eSlack\u003c\/strong\u003e for warehouse alerts and daily sales metrics\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"N8N Commerce","offers":[{"title":"Default Title","offer_id":45950270931123,"sku":"N8N-19122","price":45.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0749\/6279\/6723\/files\/eiDcnQB7e8175_aGilXwI_9Deu3E4S.png?v=1788514304","url":"https:\/\/buyflowscripts.com\/products\/postgresql-order-webhook-automation-gmail-slack-invoice-alerts","provider":"N8N Commerce","version":"1.0","type":"link"}