Key

Google Maps JavaScript API v3
The Google Maps JavaScript API v3 and therefore the PHPWCMS Google Maps Module V3.5 does not require an API key to function correctly. However, Google strongly encourage you to load the Maps API using an APIs Console key which allows you to monitor your application's Maps API usage.

Follow the steps on this page: https://developers.google.com/maps/documentation/javascript/tutorial#api_key in order to get an API Key.

Read here about the new billing model for Google Maps API: https://developers.google.com/maps/documentation/javascript/usage