eBay Shopping API
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| Value | Description | Which calls use this value * |
| CatalogItem | Reserved for future use. | (not used by any call) |
| CustomCode | (out) Reserved for internal or future use. | (not used by any call) |
| EAN | EAN value for books. (This is used more commonly in European countries.) If you know a book's EAN, you can use this instead of the eBay CatalogItem or Reference ID to search for that book. Max length of corresponding value: 13 | (not used by any call) |
| ISBN | ISBN-10 or ISBN-13 value for books. (The string length of ProductID indicates whether the ID is 10 or 13 characters.) If you know a book's ISBN, you can use this instead of the eBay CatalogItem or Reference ID to search for that book. Max length of corresponding value: 13 | (not used by any call) |
| Keywords | Reserved for future use. | (not used by any call) |
| MPN | Reserved for future use. | (not used by any call) |
| Reference | The global reference ID for an eBay catalog product. A reference ID is a fixed reference to a product (regardless of version). One reference ID can be associated with multiple CatalogItem IDs. To determine valid reference IDs for products to use as input to FindProducts, first call FindProducts with QueryKeywords (or ProductID). Each product in the response includes a reference ID. As of mid-2008, some sites (such as eBay US, Germany, Austria, and Switzerland) are updating, replacing, deleting, or merging some products (as a result of migrating from one catalog data provider to another). If you specify one of these products in a request, the call may return the product with a warning, or it may return an error if the product has been deleted. |
(not used by any call) |
| UPC | UPC value for products in Music (e.g., CDs), DVDs & Movies, and Video Games categories (or domains). If you know a product's UPC, you can use this instead of the eBay CatalogItem or Reference ID to search for that product. Max length of corresponding value: 12 | (not used by any call) |