Has anyone successfully get VPAID to work?

I am working on making my video player to support VPAID. This is the VPAID tag XML I’m working on https://ads.stickyadstv.com/vast/vpaid-adapter/5590338

This is what I got so far. I have no idea how do it initiates the ad by calling initAd() as mentioned in IAB VPAID document thus nothing is happening to my video player.

url is the javascript link i extracted from the XML

// Initialise the vastTracker with selected ad & creative
var vastTracker = new DMVAST.tracker(ad, creative)

// Loading the vpaid script
iframe = document.createElement('iframe');
iframe.id = "adloaderframe";
document.body.appendChild(iframe);
// ‘url’ points to the ad js file
iframe.contentWindow.document.write('<script src="' + url + '"></scr' + 'ipt>');
var fn = iframe.contentWindow['getVPAIDAd'];
if (fn && typeof fn == 'function') {
    VPAIDCreative = fn();
    VPAIDCreative.initAd(); // this gives javascript error
}

Any clue? What should I do next?

[ghost]

Ok it was actually pretty simple, I’m just going to leave it here too in case anyone else needs it! You need to make sure that the script tag inside the iframe is fully loaded, before you can access the “getVPAIDAd” function!

so something like this:

iframe.contentWindow.document.write('<script id="adloaderscript" src="' + url + '"></scr' + 'ipt>');

const script = iframe.contentWindow.document.querySelector('#adloaderscript')

script.onload = function() {
     // iframe.contentWindow['getVPAIDAd'] will be available here
}

[ghost]

following the same flow

iframe = document.createElement('iframe');
iframe.id = "adloaderframe";
document.body.appendChild(iframe);
// ‘url’ points to the ad js file
iframe.contentWindow.document.write('<script src="' + url + '"></scr' + 'ipt>');
var fn = iframe.contentWindow['getVPAIDAd'];

the “getVPAIDAd” function does exist inside the iframe, but iframe.contentWindow['getVPAIDAd'] returns “undefined” for me!

@briganti or anyone else have any idea why?