This power-up is used when you need to receive XML data inside the server Google Tag Manager. For example, some platforms can send webhooks only in XML format. 

In this case, you can set webhook to send data to the URL https://ss.example.com/stape/xml/

• where https://ss.example.com is the tagging server URL you use for the sGTM container.
• you can add any path after /stape/xml/, for example, https://ss.example.com/stape/xml/data, and this path will be used to send a request to your sGTM. In this case, we will send JSON to /data. 

This webhook will convert XML to JSON format. After that, use Data Client to retrieve information from the webhook.