I want to pass url parameters (hidden fields) to iframe/embedded forms on our Hubspot landing pages.
The url parameters I want to pass to the Typeform are utm_source, email and referralcode.
An example of a page I'm currently working on:
<div class="typeform-widget"
     data-url="https://xxxxxx.typeform.com/to/xxxx"
     data-transparency="50"
     data-hide-headers=true
     data-hide-footer=true
     style="width: 100%; height: 600px;" > </div>
<script> (function() {
    var qs,js,q,s,d=document,
        gi=d.getElementById,
        ce=d.createElement,
        gt=d.getElementsByTagName,
        id="typef_orm",
        b="https://embed.typeform.com/";
    if (!gi.call(d,id)) {
        js=ce.call(d,"script");
        js.id=id;
        js.src=b+"embed.js";
        q=gt.call(d,"script")[0];
        q.parentNode.insertBefore(js,q)
    }
  })()
</script>
What code do I need to add to pass the url parameters to my embedded form? Thanks