Specifies the category from which to retrieve item listings. This field takes the same category ID data as used with other eBay APIs.
Category IDs are site-specific. If the specified category ID doesn't match an existing category for the site, an invalid-category error message is returned. To determine valid categories, you can use either the Shopping API or the Trading API. In the Shopping API, use the FindItemsAdvanced call with the CategoryHistogram value in the IncludeSelector field to retrieve matching category information. In the Trading API, use calls like GetCategories and GetCategoryFeatures to determine valid values for the site.
See the
Field Index to learn which calls use categoryId.