/**
  * Saves errors or messages to WooCommerce Log (woocommerce/logs/plugin-id-xxx.txt)
  *
  * @since 2.0
  * @param string $message error or message to save to log
  * @param string $log_id optional log id to segment the files by, defaults to plugin id
  */
 public function log($message, $log_id = null)
 {
     if (is_null($log_id)) {
         $log_id = $this->get_id();
     }
     if (!is_object($this->logger)) {
         $this->logger = SV_WC_Plugin_Compatibility::new_wc_logger();
     }
     $this->logger->add($log_id, $message);
 }