Marketplace: a platform where many independent sellers list goods under a shared checkout and dispute system. Buyer protection: a platform or payment-provider program that refunds buyers when goods fail to arrive or do not match their description. Escrow: an arrangement where a third party holds the buyer's money until delivery is confirmed. Chargeback: a reversal of a card transaction requested through the card issuer when a purchase goes wrong.
Cash on delivery (COD): payment collected by the courier when the parcel is handed over; convenient, but disputes afterward are difficult. Pre-order: payment taken before stock exists, usually for a limited run with a later shipping date. Dropshipping: a model where the seller takes orders but a supplier ships directly to the buyer, often extending delivery times. Tracking number: a carrier-issued code that shows a parcel's progress and serves as basic proof of shipment.