code: public static CurrencyConversion getConversion(String termCurrencyCode, String... providers){
          Objects.requireNonNull(termCurrencyCode, "Term currency code may not be null");
          return getConversion(Monetary.getCurrency(termCurrencyCode), providers);
      }
docs: Access an instance of {@link CurrencyConversion} for the given providers.
  Use {@link #getConversionProviderNames()}} to check, which are available.
  
  @param termCurrencyCode the terminating or target currency code, not {@code null}
  @param providers        Additional providers, for building a provider chain
  @return the exchange rate type if this instance.
  @throws MonetaryException if no such {@link ExchangeRateProvider} is available or if no {@link CurrencyUnit} was
  matching the given currency code.