Prerequisite: you must have a Google account
Secure your API key to prevent quota theft for example.
“In June 2018 Google launched a new pricing plan. Google continues to offer a free tier — all developers will receive $200 of free monthly usage of our core products. In addition, this change will require you to enable billing and associate it with all of your Google Maps Platform projects. (full official announcement)” – for a summary on how this affects you as Maps Marker Pro user, please have a look at our FAQ at https://mapsmarker.com/google-maps-tos-changes
All Google´s related Terms of Services can be found at https://developers.google.com/maps/terms.
As Google gives all developers $200 of free monthly usage, only loads which exceed this amount will be directly billed by Google.