Extra Fees for WooCommerce by FantasticPlugins
Plugin URL: https://woocommerce.com/products/extra-fees-for-woocommerce/
To your current child wp theme file functions.php add next code:
add_filter('efw_gateway_fee_after_calculate', function ($fee_value) { if (class_exists('WOOCS') AND $fee_value) { global $WOOCS; $fee_value = $WOOCS->woocs_exchange_value(floatval($fee_value)); } return $fee_value; }); add_filter('efw_order_fee_after_calculate', function ($fee_value) { if (class_exists('WOOCS') AND $fee_value) { global $WOOCS; $fee_value = $WOOCS->woocs_exchange_value(floatval($fee_value)); } return $fee_value; });