the niu Keg - SDK snippet

https://the.niu.de/hotels/deutschland/hamburg/the-niu-keg

Add the following code towards the end of <body> section of your page.

<script> ;(function() { var script = document.createElement('script'); script.src = 'https://assets.dialogshift.com/code/pro1626.js'; document.getElementsByTagName('head')[0].appendChild(script); })() </script>

As an alternative you can add the snippet via the GTM as described here:
https://support.google.com/tagmanager/answer/6107167?hl=en