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If a user would like to retrieve active listings that are associated with a specific eBay catalog product, they can make a findItemsByProduct call in the Finding API. However, now this call only retrieves catalog product data, and no longer retrieves any listing-related data. Important: In the past, this call retrieved details on active listings that were associated with the retrieved catalog products. See the Specifying OAuth scopes topic for more information on OAuth scopes. See the client credentials grant flow topic for more information on generating and managing OAuth application access tokens. Note: Developers using Shopping API calls must authenticate with an OAuth application access token in the HTTP header X-EBAY-API-IAF-TOKEN and use OAuth application access tokens with a scope that includes.