I don't have a code example, sorry (we serve only through ad manager and our set-up isn't all that standard). To be aware though that the default wording and options in Quantcast Choice are not compliant with the Google EU User Consent policy. We've been supporting quite a few website who use Quantcast Choice but have been flagged by Google as non compliant. We produced a free guide on this it if is helpful oko.uk/resources/euu-consent

The guide deals with policy rather than implementation. For implementation I usually send people here: [help.quantcast.com...]