$WOOCS->convert_from_to_currency($value, $from_currency, $to_currency)
global $WOOCS;
$converted_value = $WOOCS->convert_from_to_currency(100, 'USD', 'EUR');//converted result is in EURglobal $WOOCS;
$converted_value = $WOOCS->convert_from_to_currency(100, 'USD', 'EUR');//converted result is in EUR