FOX - Currency Switcher Professional for WooCommerce

Plugin link: https://affiliatewp.com/add-ons/official-free/store-credit/

• In file wp-content\plugins\affiliatewp-store-credit\integrations\class-woocommerce.php add next code:

  if (class_exists('WOOCS') AND $balance) {
      global $WOOCS;
      $balance = $WOOCS->woocs_exchange_value(floatval($balance));
  }