public function is_attendee_id( $attendee_id ) {
		if ( empty( $attendee_id ) ) {
			return false;
		}

		// get ticket provider
		$ticket_type = tribe( 'tickets.data_api' )->detect_by_id( $attendee_id );

		//get ticket
		$ticket = get_post( $attendee_id );

		return ! empty( $ticket_type['post_type'] ) && ! empty( $ticket ) &&  $ticket_type['post_type'] === $ticket->post_type;
	}