Enabling the Google People API
You must enable the Google People API if it’s not enabled already.
Steps
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Go to the Google API Console at https://console.developers.google.com.
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In the Projects list, select a project or create a new one.
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On the left, click Library.
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Locate the People API.
If you need help finding the API, use the search field.
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Click Enable.
Next steps
For more information, see https://support.google.com/googleapi/answer/6158841.