public function get_attendees_by_id( $post_id, $post_type = null ) {

		// PayPal Ticket Orders are a unique hash
		if ( ! is_numeric( $post_id ) ) {
			$post_type = 'tpp_order_hash';
		}

		if ( ! $post_type ) {
			$post_type = get_post_type( $post_id );
		}

		switch ( $post_type ) {
			case $this->attendee_object:
				return $this->get_attendees_by_attendee_id( $post_id );

				break;
			case 'tpp_order_hash':
				return $this->get_attendees_by_order_id( $post_id );

				break;
			case $this->ticket_object:
				return $this->get_attendees_by_ticket_id( $post_id );

				break;
			default:
				return $this->get_attendees_by_post_id( $post_id );

				break;
		}

	}