code: @Override
  	public CorpState[] CheckCorpNum(String MemberCorpNum, String[] CorpNumList)
  			throws PopbillException {
  		
  		String PostData = toJsonString(CorpNumList);
  		
  		return httppost("/CloseDown",
  				MemberCorpNum,PostData, null, CorpState[].class);
  	}
docs: /*
  (non-Javadoc)
  
  @see com.popbill.api.CloseDownService#CheckCorpNum