Authorized Buyers offers "semi-transparent" targeting in addition to branded. In a semi-transparent bid request, the BidRequest.url field is truncated to include only the top-level domain.
For example, if the full URL is "https://mail.google.com/ads/ad.html", the truncated version in BidRequest.url will be "https://google.com".
Deals with semi-transparent inventory will show "Semi-transparent" in the Branding row on the details page. Also, note that because mobile app inventory always transacts as branded, the semi-transparent setting is only available for desktop and mobile web.