How to Implement Multichannel Widget in Magento?

Magento uses Require JS, hence it needs different script.

from your integration page you might find this:

 <script>
 document.addEventListener('DOMContentLoaded', function() {
 var s,t; s = document.createElement('script'); s.type = 'text/javascript';
 s.src = 'https://s3-ap-southeast-1.amazonaws.com/qiscus-sdk/public/qismo/qismo-v4.js'; s.async = true;
 s.onload = s.onreadystatechange = function() { new Qismo("YOUR-APP-ID"); }
 t = document.getElementsByTagName('script')[0]; t.parentNode.insertBefore(s, t);
 });
</script>

For Require JS, change them to this one:

<script>
 require(['https://s3-ap-southeast-1.amazonaws.com/qiscus-sdk/public/qismo/qismo-v4.js'], function(Qismo){
   new Qismo("YOUR-APP-ID");
 })
 </script>

Please make sure to use the JS URL in your integration page for the latest JS. The codeblock above is just an example.