code: @Override
  	public Response updateContact(String CorpNum, ContactInfo contactInfo, String UserID) throws PopbillException {
  		String postData = toJsonString(contactInfo);
  
  		return httppost("/IDs", CorpNum, postData, UserID, Response.class);
  	}
docs: /* (non-Javadoc)
  @see com.popbill.api.BaseService#updateContactMember(java.lang.String, com.popbill.api.ContactInfo, java.lang.String)