public int pay(String number, Double fee) {
Balance b = get(number);
if (b == null) return -1;
Map<String, Object> map = new LinkedHashMap<>();
map.put("carnumber", number);
map.put("balance", b.getBalance() - fee);
JSONArray json = JSONArray.fromObject(map);
String jstr = json.get(0).toString();
String url = Values.DOMAIN + "Balance/" + b.getId();
String resultXML = HttpHelper.SendHttpRequest("put", url, jstr);
System.out.println(resultXML);
return 0;
}
