FOX - Currency Switcher Professional for WooCommerce

Plugin link: https://codecanyon.net/item/woocommerce-advanced-shipping/8634573

//add next code in your wp theme functions.php file
add_filter('wcml_shipping_price_amount', 'woof_compatibility_as');

function woof_compatibility_as($val) {
    if (class_exists('WOOCS')) {
        global $WOOCS;
        return $WOOCS->woocs_exchange_value(floatval($val));
    }

    return $val;
}