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A popup will show up with a generated API key of the app. You now have your Google API key, note this key down.
Setup Google API Key for phpFox Settings
As you just retrieved your Google API key, you need to setup and put it into your phpFox settings.
From Admin CP, type "Google API key" to search settings box and select the result with path Apps >> Core >> Settings.
Enter your Google API key here and Save Changes.