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APIs to place bids on auction items and to manage and complete order checkout.

Name Description API Reference Release Notes
Order API Open a guest checkout session, update orders, apply a coupon to the order, retrieve order, payment status, and shipment details, and pay for the order. For eBay member checkouts, it also provides legacy IDs to enable you to use the Post Order API for returns and cancellations.
Offer API Place bids for a buyer on auction items and retrieve the bidding details for an auction where the buyer has placed a bid.
Traditional PlaceOffer API To place a bid or a Best Offer on a listing, or to make a purchase.