Aspect filters refine (limit) the number of items returned by a find request. Obtain input values for aspectFilter fields from an aspectHistogramContainer returned in the response of a previous query.

By issuing a series of find queries, you can continually refine the items returned in your responses. Do this by repeating a query using the aspect values returned in one response as the input values to your next query.

For example, the aspectHistogramContainer in a response on Men's Shoes could contain an aspect of Size, along with "aspect values" for the different sizes currently available in Men's Shoes. By populating aspectFilter fields with the values returned in an aspectHistogramContainer, you can hone the item results returned by your new query.

Note: If a call that specifies an outputSelector value of AspectHistogram returns aspectHistogramContainer.domainName, this is a sign that aspect histogram data might not be returned if you also specify an aspectFilter in the next call. To ensure that aspect histogram data is returned for the next call, add a domainFilter to the call as well.

Specifies the category from which you want to retrieve item listings. This field can be repeated to include multiple categories.

If a specified category ID doesn't match an existing category for the site, eBay returns an invalid-category error message. To determine valid categories, use the Shopping API GetCategoryInfo call.

Category searches are not supported on the eBay Italy site (global ID EBAY-IT) at this time.

Restricts results to items listed within the specified domain. Domains are a buy-side grouping of items. such as shoes or digital cameras. A domain can span multiple eBay categories.

Reduce the number of items returned by a find request using item filters. Use itemFilter to specify name/value pairs. You can include multiple item filters in a single request.

Specify one or more words to use in a search query for finding items on eBay. By default, queries search item titles only. When running queries, it is best to include complete keywords values--eBay checks words in context with each other. If you are using a URL request and your keyword query consists of multiple words, use "%20" to separate the words. For example, use "Harry%20Potter" to search for items containing those words in any order. Queries aren't case-sensitive, so it doesn't matter whether you use uppercase or lowercase letters.

You can incorporate wildcards in a multi-word search. For example, "ap*%20ip*" returns results for "apple ipod" among other matches. The words "and" and "or" are treated like any other word (and not their logical connotation). Only use "and", "or", or "the" if you are searching for listings containing those specific words.

findCompletedItems requires that you specify either keywords or a categoryId in the search criteria.

Defines what data to return, in addition to the default set of data, in a response.

If you don't specify this field, eBay returns a default set of item fields. Use outputSelector to include more information in the response. The additional data is grouped into discrete nodes. You can specify multiple nodes by including this field multiple times, as needed, in the request.

If you specify this field, the additional fields returned can affect the call's response time (performance), including in the case with feedback data.

Input ISBN, UPC, EAN, or ReferenceID (ePID) to specify the type of product for which you want to search.

For example, to search using an ISBN, specify productID.type=ISBN and set productID.value to an ISBN value. To search using an eBay Product Reference ID, specify productID.type= ReferenceID and set productID.value to an ePID value (also known as an Bay Product Reference ID). If you do not know the ePID value for a product, use FindProducts in the eBay Shopping API to retrieve the desired ePID:

FindProducts