public function getExchangeRate($currency1, $currency2)
    {
        $list = $this->getExchangeRates([[$currency1, $currency2]]);

        return isset($list[0]) ? $list[0] : null;
    }
public function getExchangeRate($currency1, $currency2)
    {
        $list = $this->getExchangeRates([[$currency1, $currency2]]);

        return isset($list[0]) ? $list[0] : null;
    }
public function getExchangeRate ( $ currency1 , $ currency2 ) { $ list = $ this -> getExchangeRates ( [ [ $ currency1 , $ currency2 ] ] ) ; return isset ( $ list [ 0 ] ) ? $ list [ 0 ] : null ; }
Get exchange rate for two currencies. Accepts concatenated ISO 4217 currency codes.

@param string $currency1
@param string $currency2

@return Quote|null
Get exchange rate for two currencies . Accepts concatenated ISO 4217 currency codes .