active_promotionsproperty to Accounts, as returned by the View Account (GET /account)) endpoint. This property lists all active promotions on your account.
Promotions generally offer a set amount of credit that can be used toward your Linode services, and the promotion expires after a specified date. Simply put, a monthly cap on the promotional offer is set. In other words, a promotion offers a certain amount of credit every month, until either the expiration date is passed, or until the total promotional credit is used, whichever comes first.
Added promotion to the types of Notifications that can be returned by the List Notifications (GET /account/notifications) endpoint.