postman pre-script to obtain bokun signature

bokun signature

const moment = require('moment');
let timestamp = moment().utc().format("YYYY-MM-DD HH:mm:ss");
pm.globals.set("timestamp", timestamp);
const access = "ACCESS_KEY";
let csting = timestamp+access+"GET"+pm.request.url.getPathWithQuery();
const secret = "SECRET_KEY";
const hmac = CryptoJS.HmacSHA1(csting, secret);
const signature = hmac.toString(CryptoJS.enc.Base64);
pm.globals.set("signature", signature);