Full Ecommerce Store Setup

I need a production-ready online store for physical products that will ship nationwide. The core flow is simple: visitors browse the catalogue, add items to their cart, check out, and pay online through UPI. Once payment clears, I want the system to trigger the usual order-confirmation email and pass the order straight into the back-office dashboard so I can print packing slips and create shipping labels in one place.

The build should include:
• A clean, responsive storefront with category and product pages
• Cart and single-page checkout wired to a reliable UPI payment gateway
• Real-time shipping rate calculation and order tracking links for customers
• An admin panel where I can add/edit products, see orders at a glance, and update fulfilment status
• Basic SEO settings (meta tags, sitemap) so the site is ready for indexing

If you prefer Shopify, WooCommerce, or another proven platform, let me know which fits best and why—speed, security, and low maintenance matter more to me than the specific stack. Once everything passes test transactions and a few sample shipments, the job is done.