public function currencySymbol($currencySymbol)
    {
        if (is_null($currencySymbol)) {
            return $this->currencySymbol;
        }

        $this->currencySymbol = $currencySymbol;

        return $this;
    }
public function currencySymbol($currencySymbol)
    {
        if (is_null($currencySymbol)) {
            return $this->currencySymbol;
        }

        $this->currencySymbol = $currencySymbol;

        return $this;
    }
public function currencySymbol ( $ currencySymbol ) { if ( is_null ( $ currencySymbol ) ) { return $ this -> currencySymbol ; } $ this -> currencySymbol = $ currencySymbol ; return $ this ; }
Set the currency symbol used by the plan.

@param  string  $symbol
@return $this|string
Set the currency symbol used by the plan .