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When you open the page and when you click through to the seller, it records an anonymous event: the time, a random session number that exists only while the page is open, the page address, the tracking code of the ad group, and the Google click identifier if the address contains one. When you click through to the seller, that click identifier and the ad group's tracking code travel with you, so ClickBank can tell Google Ads whether the ad led to a sale. Nothing about you personally is passed on. No name, e-mail or other personal data is collected.
The seller's site and ClickBank have their own privacy policies, which apply once you leave this page.