Publish or undeploy promotion via a cronjob in Hybris

I would like to publish or undeploy promotions which is built on the new promotion engine (rule base) via a cronjob according to dates that determine in the backoffice as a seperate model that has promotion code, start date and end date.

I could not find the promotion api in help hybris to perform publish and undeploy operations like in the backoffice. And also I could not find related promotion services in the project.

Any help would be appreciated.