A method, apparatus, and computer program product for transacting a product purchase by a user. The product purchase is processed by a purchase server that recorded a unique user identification and is connected to an information providing server and a client (connected to the user) via a network. The purchase server: receives (from the information providing server) purchase data including purchase identity information including a description of a product selected by the user for purchase; receives (from the client) redirect data comprising purchase identity information describing the selected product; sends (to the client) a request for the unique user identification; receives (from the client) identification data pertaining to the user; authenticates the received identification data pertaining to the user; and validates purchase identity information in the received redirect data. The purchase identity information in both the purchase data and the redirect data does not include the unique user identification.