*/
function llms_get_engagement_triggers() {
	/**
	 * Filter the engagement triggers
	 *
	 * @since Unknown
	 *
	 * @param array $engagement_triggers An associative array of engagement triggers. Keys are the engagement trigger slugs, values are their description.
	 */
	return apply_filters(
		'lifterlms_engagement_triggers',
		array(
			'user_registration'      => __( 'Student creates a new account', 'lifterlms' ),
			'access_plan_purchased'  => __( 'Student Purchases an Access Plan', 'lifterlms' ),
			'course_enrollment'      => __( 'Student enrolls in a course', 'lifterlms' ),
			'course_purchased'       => __( 'Student purchases a course', 'lifterlms' ),
			'course_completed'       => __( 'Student completes a course', 'lifterlms' ),
			// 'days_since_login' => __( 'Days since user last logged in', 'lifterlms' ), // @todo.
			'lesson_completed'       => __( 'Student completes a lesson', 'lifterlms' ),
			'quiz_completed'         => __( 'Student completes a quiz', 'lifterlms' ),
			'quiz_passed'            => __( 'Student passes a quiz', 'lifterlms' ),
			'quiz_failed'            => __( 'Student fails a quiz', 'lifterlms' ),
			'section_completed'      => __( 'Student completes a section', 'lifterlms' ),
			'course_track_completed' => __( 'Student completes a course track', 'lifterlms' ),
			'membership_enrollment'  => __( 'Student enrolls in a membership', 'lifterlms' ),
			'membership_purchased'   => __( 'Student purchases a membership', 'lifterlms' ),
		)
	);