const crypto = require("crypto");
const request = require("request");

const environment = "https://test-openapi-hk.qfapi.com";
const app_code = "YOUR_APP_CODE";
const client_key = "YOUR_CLIENT_KEY";

const payload = {
  syssn: "20191231000300020063521806"
};

const sorted = Object.keys(payload)
  .sort()
  .map(k => `${k}=${payload[k]}`)
  .join("&");

const sign = crypto
  .createHash("md5")
  .update(sorted + client_key)
  .digest("hex")
  .toUpperCase();

request({
  uri: environment + "/trade/v1/query",
  method: "POST",
  headers: {
    "X-QF-APPCODE": app_code,
    "X-QF-SIGN": sign
  },
  form: payload
}, function(error, response, body) {
  console.log(body);
});