code: public function today($sourceName, $currencyCode, $rateType = RateType::MEDIAN)
      {
          try {
              return $this->manager->today($sourceName, $currencyCode, $rateType);
          } catch (\Exception $e) {
              $this->logger->error('Unable to fetch today\'s rate for {currency_code} of type {rate_type} from source {source}.', [
                  'currency_code' => $currencyCode,
                  'rate_type' => $rateType,
                  'source' => $sourceName,
                  'exception' => $e,
              ]);
              throw $e;
          }
      }
docs: {@inheritdoc}