To set up a webhook that will be able to post feedback results directly to Google chat (Hangouts Chat) please follow the directions in this article: How to create an outgoing webhook? The instructions below will walk you through the steps you need to take on the Hangouts Chat site to be able to receive the incoming data from Mopinion.
These are the specific steps you need to take in Hangouts Chat to set up an endpoint for the webhook
In the chat room menu select Configure Webhooks
Click on Add Webhook
Fill in the name field and optionally the avatar URL field
You can now copy the webhook URL from the Configure Webhooks screen and use that as your endpoint
The Webhook URL you have created is the endpoint you need.