When I ran my test see here, it was a while ago now, I just used one of my domains as the URL, not related to the app or google play in any way. That worked then.
I found the answer to that one which I put in here to help anyone else.
It fails if you create the modules and copy & paste the code into them. The only way it worked for me was to Add Existing Module then go look for it. Worked first time then.