The website I am using is test.herokuapp.com.
The referer I’ve setup I’ve tried are:
http://test.herokuapp.com
test.herokuapp.com/*.
*.test.herokuapp.com/*.
test.herokuapp.com/
The error I get everytime is:
Google has disabled use of the Maps API for this application. The provided key is not a valid Google API Key, or it is not authorized for the Google Maps Javascript API v3 on this site.
Try this one: