How to configure Google API Key for TeeZee™ Timezones for Salesforce
Create a Google Cloud Project (if you haven’t already) in a Google Developer Account (https://console.cloud.google.com/)
Select Library from the project
You should now see a search screen
Search for Time Zone and click on Time Zone API
Press Enable button to enable the API
Verify that the Time Zone API is enabled
Now perform the search step again and search and select Geocoding API. Press the Enable button.
Now you should have two enabled APIs
Select Credentials from the APIs & Services pop-out (click on Google Maps Platform to see this)
Now press the + Create Credentials link
This will create an API key, which you should copy and then close the window