Setup

<style>
.ddweb-verify-wrap {
  margin: 0 -20px;
  padding: 0;
}
iframe#ddweb-verify {
  display: block;
  width: 100%;
  min-height: 700px;
  border: none;
}
</style>

<div class="ddweb-verify-wrap">
  <iframe
    id="ddweb-verify"
    src="https://portal.decisivedatatech.com/api/ddweb/verify/"
    title="DDWeb Member Verification"
    allowfullscreen>
  </iframe>
</div>

<script>
window.addEventListener('message', function(e) {
  if (e.origin !== 'https://portal.decisivedatatech.com') return;
  if (e.data && e.data.type === 'ddweb-resize') {
    document.getElementById('ddweb-verify').style.minHeight = e.data.height + 'px';
  }
});
</script>