code: @Override
  	public Response register(String CorpNum, Cashbill cashbill)
  			throws PopbillException {
  		return register(CorpNum, cashbill, null);
  	}
docs: /* (non-Javadoc)
  @see com.popbill.api.CashbillService#register(java.lang.String, com.popbill.api.cashbill.Cashbill)