I built NovaMart, a Next.js 16 storefront backed by four orchestrated n8n workflows that automate the entire post-checkout lifecycle. The moment a customer places an order, abandons a cart, or files a support request, the system takes over: orders move through confirm → ship → deliver → review automatically with every step visible in Slack; GPT-4o-mini classifies incoming support requests and routes them without a human in the loop; idle carts trigger timed recovery emails with a discount nudge; and daily inventory checks flag low stock and auto-pause zero-stock items before they turn into lost sales.