{
// Required
meeting_id: Id;
title: string;
// Optional
description: string;
default_time: number;
}Creates a new projector countdown. The title must be unique within the meeting.
If default_time is given, it is set as projector_countdown/default_time and projector_countdown/countdown_time. If it is not given both fields are set to meeting/projector_default_countdown_time.
The request user needs projector.can_manage.