Abstract: Described herein is a system and techniques for implementing a system that enables exchange of user information between retail and advertising domains while maintaining data security and privacy requirements. In some embodiments, a landing page is generated in response to a user interaction with a user interface element. The landing page is generated within the retail domain while the advertisement is in an advertising domain. The landing page, while in the retail domain, can access stored user information from the retail website and pre-fill forms of the landing page which a user can verify and submit to the advertising, thereby sharing the user information into the advertising domain.