private Map<String, Certificate> getCertificates(){
        String response = obcsRestService.getPostPlainJson();
        JSONObject jstr = JSONObject.parseObject(response);
        JSONObject result = (JSONObject) jstr.get("result");
        String payload = (String) result.get("payload");
        JSONArray certificates = JSONArray.parseArray(payload);
        Map<String, Certificate> map = new HashMap<String, Certificate>();
        for (int i = 0; i < certificates.size(); i++) {
            JSONObject cert = certificates.getJSONObject(i);
            Certificate ceObj = JSONObject.parseObject(String.valueOf(cert.get("Record")), Certificate.class);
            map.put(cert.getString("Key"), ceObj);

        }
        return map;
    }