Vtex Custom - fingerprint

<script>
  window.vtex.deviceFingerprint = '';

  var netpay_total = 0;
  var _this = this;
  vtexjs.checkout.getOrderForm().done(function(orderForm) {
    for (var key in orderForm.totalizers) {
      var item = orderForm.totalizers[key];
      netpay_total=netpay_total+item.value/100;
    }
    _this.loadJS("https://cdn.netpay.mx/js/latest/netpay3ds-noConflict.js", false);
  });

  var deviceFingerprint = getuuid();
  window.vtex.deviceFingerprint = deviceFingerprint;
  initDFP(deviceFingerprint);
  var localSessionId = null;

  function doProfile(orgId, sessionId, hostname){
    var head = document.getElementsByTagName("head").item(0);
    var url = "https://" + hostname + "/tags.js?org_id=" + orgId + "&session_id=" + sessionId + "&page_id=1&allow_reprofile=1";
    var script = document.createElement("script");
    script.setAttribute("type", "text/javascript");
    script.setAttribute("src", url);
    head.appendChild(script); console.log('Profile should have started...');
    body = document.getElementsByTagName("body").item(0);
    noscript = document.createElement("noscript");
    iframe = document.createElement("iframe");
    iframe.setAttribute("style", "width: 100px; height: 100px; border: 0; position:absolute; top: -5000px;");
    iframe.setAttribute("src", url);
    noscript.appendChild(iframe);
    body.insertBefore(noscript, body.childNodes[0]);
  }

  function initDFP(sessionId) {
    localSessionId = sessionId;
    console.log('Init profiling ', Math.floor(Date.now() / 1000))
    var timeout = 3000;
    var sasOrgId = "9ozphlqx";
    var csOrgId = "9ozphlqx";
    var merchantId = "netpaymx_retail";
    var hostname = "h.online-metrix.net/fp";
    doProfile(sasOrgId, sessionId, hostname);
    setTimeout(startOnTimer(sessionId) , timeout);
  }

  function startOnTimer(sessionId) {
    var csOrgId = "9ozphlqx";
    var merchantId = "netpaymx_retail";
    var hostname = "h.online-metrix.net/fp";
    doProfile(csOrgId, merchantId + sessionId, hostname);
  }

  function getuuid() {
    var dt=new Date().getTime();
    var uuid='xxxxxxxxxxxxx4xxxyxxxxxxxxxxxxxxx'.replace(/[xy]/g,function(c){
      var r = (dt + Math.random()*16)%16 | 0;
      dt = Math.floor(dt/16);
      return (c=='x' ? r : (r&0x3|0x8)).toString(16);
    });
    return uuid;
  }

  function tmx_profiling_complete(sessionId) {
    console.log('Finished ', sessionId, '-', Math.floor(Date.now() / 1000));
  }

  function loadJS(FILE_URL, async) {
    console.log("Loading library.");
    var scriptEle = document.createElement("script");

    scriptEle.setAttribute("src", FILE_URL);
    scriptEle.setAttribute("type", "text/javascript");
    scriptEle.setAttribute("async", async);

    document.body.appendChild(scriptEle);

    scriptEle.addEventListener("load", function(){
      _this.callbackLoadJs();
    });

    scriptEle.addEventListener("error", function(ev) {
      console.log("Error on loading file", ev);
    });

  }

  function callbackLoadJs() {
    var _this = this;
    netpay3ds.setSandboxMode(false);
    netpay3ds.init(function () {
      netpay3ds.config(_this, netpay_total, _this.callbackReferenceId);
    });
  }

  function callbackReferenceId(_this, referenceId) {
    window.vtex.deviceFingerprint = window.vtex.deviceFingerprint + '_' + referenceId;
  }
</script>