code: @Override
      public TaxinvoiceInfo[] getInfos(String CorpNum, MgtKeyType KeyType,
                                       String[] MgtKeyList) throws PopbillException {
          if (KeyType == null)
              throw new PopbillException(-99999999, "관리번호형태가 입력되지 않았습니다.");
          if (MgtKeyList == null || MgtKeyList.length == 0)
              throw new PopbillException(-99999999, "관리번호 목록이 입력되지 않았습니다.");
  
          String PostData = toJsonString(MgtKeyList);
  
          return httppost("/Taxinvoice/" + KeyType.name(), CorpNum, PostData,
                  null, TaxinvoiceInfo[].class);
      }
docs: /* (non-Javadoc)
  @see com.popbill.api.TaxinvoiceService#getInfos(java.lang.String, com.popbill.api.taxinvoice.MgtKeyType, java.lang.String[])