How does the system handle price or stock changes while an item is in the cart?

Carts can sit for a while, during which a price or stock level might change. At checkout the system re-validates the cart against current price and availability and warns the customer of any changed price or reduced availability before payment. This prevents the two bad outcomes — charging a stale price, or selling stock that's no longer there — by making the moment of payment the…

Carts can sit for a while, during which a price or stock level might change. At checkout the system re-validates the cart against current price and availability and warns the customer of any changed price or reduced availability before payment. This prevents the two bad outcomes — charging a stale price, or selling stock that's no longer there — by making the moment of payment the point of truth. The customer sees and accepts the current reality before money moves.