code: public static CurrencyUnitBuilder of(String currencyCode, String providerName) {
          return new CurrencyUnitBuilder(currencyCode, CurrencyContextBuilder.of(providerName).build());
      }
docs: Creates a new CurrencyUnitBuilder, creates a simple CurrencyContext using the given provider name.
  
  @param currencyCode the (unique) and identifying currency code, not null.
  @param providerName the currency provider, not null.