Node.js code to access bitcoin.co.id trading api

bitcoin.js

var request = require('request');
var qs = require('querystring');
var crypto = require('crypto');

var secretKey = "my secret key";
var apiKey = 'public API key';

var postData = {
    method: 'getInfo',
    nonce: new Date().getTime()
};

console.log("params: " + qs.stringify(postData));
console.log("Sign: " + crypto.createHmac('sha512', secretKey).update(qs.stringify(postData)).digest('hex'));
console.log("API key: " + apiKey);

var req = request.post({
    url: 'https://vip.bitcoin.co.id/tapi',
    headers: {
        Sign: crypto.createHmac('sha512', secretKey).update(qs.stringify(postData)).digest('hex'),
        Key: apiKey
    }
}, function(error, response, body){
    console.log(body);
});

console.log(req);