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Design a billing screen for the moment a user reviews charges and pays. This can serve two cases: the last step of checkout or a standalone invoice payment page. The page should make the amount due, what it includes, and what can still change obvious at a glance.

Show a clean cost breakdown: line items, quantity, discounts, taxes, fees, and the final total. If items can be edited or removed, keep those controls close to the relevant row and show the total updating after changes. If a promo code or discount is applied, make the applied state visible and easy to undo.

Place billing details and payment method in a clear order. Users should be able to enter name, address, card details, or choose another method without losing context. The confirm/pay action should be the strongest control on the page, with a secondary path to save, go back, or pay later if that fits the flow.

Include realistic states for loading, validation errors, and payment failure. Errors should stay next to the field or step that needs attention, and the user should not lose entered information when something goes wrong.