Computer systems and methods for processing ad server transactions are provided. In some embodiments, the computer systems and methods may comprise determining an application to execute on an Internet-connectable device in response to a user interaction with an advertisement displayed on the Internet-connectable device; causing the Internet-connectable device to execute the application; receiving a security token, wherein the security token indicates successful authentication of the user by a transaction server associated with the application; after receiving the security token, initiating at least one transaction with the transaction server on behalf of the application in response to a user action within the application; and communicating results of the at least one transaction to the user.