public function __construct() {
		// Only show promo if the events plugin is not active.
		if ( class_exists( 'LLMS_Events_Plugin' ) ) {
			return;
		}

		add_filter( 'llms_metabox_fields_lifterlms_course_options', array( $this, 'add_course_promo_tab' ) );
		add_filter( 'llms_metabox_fields_lifterlms_membership', array( $this, 'add_membership_promo_tab' ) );
		add_filter( 'llms_metabox_fields_lifterlms_lesson', array( $this, 'add_lesson_promo_tab' ) );
	}