E-Commerce Site With Payment Gateway

I need a web developer to build a straightforward e-commerce site whose core requirement is a fully functional payment-gateway integration. The store should let shoppers browse products, add them to a cart, check out securely, and generate an order summary that I can track from an admin dashboard.

My priorities are:
• Clean, responsive layout that works on mobile and desktop.
• Smooth checkout flow tied into a reliable payment provider (please suggest the best option you’ve worked with).
• Basic product and order management so I can add items, update stock, and process refunds without touching code.

Product search/filter or customer reviews might be added later, so write the code in a way that leaves room for those modules. Deliver the finished site, handoff documentation, and a quick walk-through video so I can maintain it myself after launch.