Checkout flow on Stepper — shipping with a gliding delivery-speed choice, display-only payment fields and an editable review — beside an order summary with compact quantity steppers, a promo code that shakes when invalid and pops a removable badge when valid, and subtotal, discount, tax and total that roll on every change.
pnpm dlx shadcn@latest add "https://karaui.kamisama-v0.my.id/r/checkout.json"