该应用程序定义一个基本产品目录，含有每个SKU的价格和说明，允许用户使用YQL INSERT查询添加这些商品到其payvment车。
This application defines a basic product catalog, with prices and descriptions for each SKU, and allows users to add these items to their Payvment cart using YQL INSERT queries.
inventory服务使用此sku来确定库存系统中是否存在此商品。
The inventory service USES this SKU to see if the item is present in the inventory system.
catalog服务用于查找正在寻找的商品的编号或SKU。
The catalog service is used to find the part number, or SKU, of the item that is to be looked up.
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