A Courier User profile reflects the most recent information about a user.
The Lists API lets you create Lists and subscribe one or more recipient profiles to them in the Courier database. You can send a message to all the recipients you subscribed to that list with a single Send API call.
Census means access to data is never a blocker for our revenue teams – if they want to run a growth experiment, the data is always available.
Census is the easiest way to share a consistent view of your data across your entire business. Define your models, metrics, and business logic in your data warehouse and sync them to all your operational tools.