Your Hangouts Chat Incoming Webhook URL will look like this:
The shoutrrr service URL should look like this:
In other words the incoming webhook URL with
https replaced by
Creating an incoming webhook in Hangouts Chat¶
Open the room you would like to add Shoutrrr to and open the chat room menu.
Then click on Configure webhooks.
Name the webhook and save.
Copy the URL.
Format the service URL by replacing