NovaKur One-Page Checkout re-skins the OpenCart 4.1 checkout into one continuous accordion: cart summary, customer details (guest or login), shipping address, delivery method, payment method and order confirmation, each opening automatically as the previous one is completed. It drives OpenCart's own AJAX checkout endpoints (checkout/register.save, checkout/shipping_address.save, checkout/shipping_method.quote|save, checkout/payment_method.getMethods|save, checkout/confirm.confirm) rather than reimplementing them, so every installed payment and shipping extension, every custom field, tax rule and order total keeps working exactly as before. A sticky live order summary sits alongside the accordion and refreshes itself whenever a step changes the totals. Installs as an event on the checkout route — no core files are edited and no theme files are overwritten.