Abstract: A method of using a unique identifier to integrate an offline experience of a user with an online experience of the user. The method includes receiving a unique identifier during a transaction related to the online experience. The method further includes using the unique identifier to obtain at least one of an offline experience identifier and a user identifier, the offline experience identifier being usable to access at least one offline experience data item which is relevant to the offline experience, the user identifier being usable to access at least one user data item which is relevant to the user. The method further includes tailoring the online experience based on at least one offline experience data item and at least one user data item.