Sales are a great way to promote the items in your eBay store. You can create sales that are seasonal, for specific holidays, for specific categories, or just to clear out inventory. Sales events promote your eBay store by creating excitement and encouraging buyers to browse and buy. Promotional sales apply to fixed-price and auction listings. For auction listings, only free shipping can be offered as a promotion.
Sellers and developers are encouraged to use the Marketing API which provides all Promotions Manager and Promoted Listings capabilities required to create and manage sales.