code: public static BigMoney zero(CurrencyUnit currency, int scale) {
          return BigMoney.of(currency, BigDecimal.valueOf(0, scale));
      }
docs: Obtains an instance of {@code BigMoney} representing zero at a specific scale.
  <p>
  For example, {@code zero(USD, 2)} creates the instance {@code USD 0.00}.
  
  @param currency  the currency, not null
  @param scale  the scale to use, zero or positive
  @return the instance representing zero, never null
  @throws IllegalArgumentException if the scale is negative