When referring to the GIS Integration Help, users may wonder whether the "Google Maps API" service has changed to the "Google Maps Engine Pro" service ?
It means website "Google Maps Engine Pro" is shown when clicking the "Google Maps API" link on the following page of the GIS Integration Help:
Home > Google Maps integration > Setup

This "Google Maps API" is linked to http://www.google.com/enterprise/earthmaps/maps.html
But that URL page no longer exists, with the result that users are redirected to the other page.
For instance, you can see the web page "Google Maps Engine Pro" by redirecting to http://www.google.com/enterprise/mapsearth/
The "Google Maps API" is not the same service as "Google Maps Engine Pro".
Please access the following URL for the "Google Maps API" service:
https://developers.google.com/maps/licensing