code: @Override
  	public ContactInfo[] listContact(String CorpNum) 
  			throws PopbillException {
  			
  		return httpget("/IDs", CorpNum, null, ContactInfo[].class);
  	}
docs: /*
  (non-Javadoc)
  @see com.popbill.api.BaseService#listContact(java.lang.String, java.lang.String)