Full Extract API URL through which to process pages. E.g., &apiUrl=https://api.diffbot.com/v3/analyze to process matching links via the Analyze API, which will automatically determine the page type to extract as. The Extract API URL can include querystring parameters to tailor the output.
For example, &apiUrl=https://api.diffbot.com/v3/product?fields=querystring,meta will process matching links using the Product API, and also return the querystring and meta fields.