I run a physical retail store and now want to sell the same products online through a dedicated website. The core requirement is straightforward: shoppers must be able to browse items, add them to a cart, and complete checkout using UPI. If you can also keep the door open for other payment rails such as cards or PayPal later, even better, but UPI has to work flawlessly on day one. A clean, mobile-responsive storefront, clear product pages, inventory control, and an easy-to-use admin dashboard are essential so I can manage stock, prices, and orders without technical help. SEO-friendly code, fast loading times, and basic security best practices (SSL, secure checkout, etc.) are expected. Deliverable: a fully functional e-commerce site deployed on my preferred hosting, with UPI payments live and a brief hand-off guide so I can maintain products myself.