/**
  * Add debug log message
  *
  * @since 1.1
  * @param string $message
  */
 public static function add_debug_log($message)
 {
     if (!is_object(self::$log)) {
         self::$log = WC_Compat_iPay88::get_wc_logger();
     }
     self::$log->add('ipay88', $message);
 }