Connect a payment processor or ecommerce backend, add verified business/contact details, configure shipping destinations and rates, define taxes where applicable, publish return and shipping policies based on your actual operations, and replace concept product data with verified supplier or manufacturer specifications.
A static HTML website can safely provide product browsing and a local cart, but it should not pretend to process cards, store payment information or confirm inventory without a real secure backend. This page makes that boundary clear while keeping the site ready for later integration.