/**
  * {@inheritdoc}
  */
 public function load($source_currency_code, $destination_currency_code)
 {
     $exchange_rate = $this->exchangeRateProvider->load($source_currency_code, $destination_currency_code);
     return ExchangeRate::createFromExchangeRate($exchange_rate, $this->getPluginId());
 }
 public function load($sourceCurrencyCode, $destinationCurrencyCode)
 {
     $exchangeRate = $this->decoratedExchangeRateProvider->load($sourceCurrencyCode, $destinationCurrencyCode);
     return call_user_func($this->processCallback, $exchangeRate);
 }