var CryptoJS = require("crypto-js");
var time = Date.now();
time = '' + time;
var apiIdentifier = 'INSERT IDENTIFIER HERE';
var apiSecret = 'INSERT SECRET HERE';
var signature = CryptoJS.HmacSHA256(time, apiSecret).toString();

pm.request.headers.add({key:'cache-control',     value: 'no-cache'});
pm.request.headers.add({key:'content-type',      value: 'application/json'});
pm.request.headers.add({key:'cxalloy-identifier',value: apiIdentifier});
pm.request.headers.add({key:'cxalloy-signature', value: signature});
pm.request.headers.add({key:'cxalloy-timestamp', value: time});