Systems and methods for using tokenization are provided. In an embodiment, a first computer system receives a notification from a second computer system that user information has changed for a first user account serviced by the second computer system. The notification includes a token corresponding to a second user account serviced by the first computer system. The first user account and the second user account belong to a user. The first computer system searches for the second user account, based on the token, in a database associated with the first computer system. The first computer system updates the second user account to include the user information change and publishes the user information change to other computer systems that subscribe to updates from the first computer system. The published user information change causes the other computer systems to update corresponding user accounts to include the published user information change.