The Subscription task in a Corporate Campaign workflow
Corporate marketers enable subscriptions by adding the Subscription task to the Corporate Campaign workflow or to each occurrence in a recurring workflow.
By defining Subscriptions tasks in workflows, as opposed to the Corporate Campaign as a whole, you enable field marketers to subscribe to individual waves, drops, and lots of recurring Corporate Campaigns.
The Subscription task is a system task and starts and stops automatically according to its target start and end dates.