docs: public static ExchangeRateProvider getExchangeRateProvider(
  			ExchangeRateProviderSupplier provider,
  			ExchangeRateProviderSupplier... providers) {
  
  		List<ExchangeRateProviderSupplier> suppliers = new ArrayList<>();
  		suppliers.add(Objects.requireNonNull(provider));
          suppliers.addAll(Arrays.asList(providers));
  
  		String[] array = suppliers.stream()
  				.map(ExchangeRateProviderSupplier::get).toArray(String[]::new);
  		return getExchangeRateProvider(array);
  
  	}