I have a function to add a script tag to the body of the document

const UseScriptComponent = ({url}, e) => {
useEffect(() => {
    const script = document.createElement('script');

    script.src = url;
    script.async = true;

    document.body.appendChild(script);

    return () => {
      document.body.removeChild(script);
    }
  }, [url]);

  return null
}  

That I use inside my class as a component:

class Dashboard extends Component {
    render(){
        return (
            <div className="dashboard">
                <UseScriptComponent url='https://link_to_widget.com' /> // Test link avaiable at next example
            </div>
        );  
    }
}

The link from the script tag is supposed to show a floating button at the righ bottom corner of the screen
Nothing shows up at the screen, but the script is in fact added to the page as I can see on my Chrome DevTools elements tab.
I'm also supposed to init the widget using the code below, but I always get an error saying that bbWidget is not declared

window.addEventListener('load', () => {
    bbWidget.init({
      widgetId: 'widget_uuid',
      merchantIds: [
        // list of merchant uuids (up to 5)
      ],
    });
});

At the network tab from Chrome DevTools I got this line:

Name: widget.js
Status: 200  
Type: script  
Initiator: dashboard.js  
Size: (disk cache)  
Time: 4ms

I tested this behaviour with another widget, created from taggbox, they gave me two options to embed it on my page:
Litecode:

<div class="taggbox" style="width:380px;height:500px;" data-widget-id="102233" data-tags="false"></div><script src="https://widget.taggbox.com/embed-lite.min.js" type="text/javascript"></script>

and Iframe:

<iframe src="https://widget-lite.taggbox.com/102233?tags=false" style="width:380px;height:500px;border:none;"></iframe>

Only the second option worked, so I believe the problem is with the script tag
I've looked around for an answer but all I found was related to creating the UseScriptComponent or using Helmet as an alternative, so I'm really not sure where to go from here

UPDATE
Recommended API code:

<script async src="https://widgets.ifood.com.br/widget.js"></script>
<script>
  window.addEventListener('load', () => {
    iFoodWidget.init({
      widgetId: 'widget_uuid',
      merchantIds: ['merchant_uuid'],
    });
  });
</script>