If you do not have an infrastructure to receive and process notifications, you could make use of the extract data by polling approach.
Authenticate
Invoke the cobrand login service to perform cobrand authentication and retrieve a cobrand session token.
NOTE: If you already have an active cobrand token, you can use it.
Poll
Invoke the get data extracts event service to learn which consumers in a particular time period had data update events.
Retrieve
Invoke the get user data service for the consumers' information received in the polling step to retrieve the updated information.