To access Gmail and Google Drive data in the Google Apps environment, enable the Google APIs.
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Log on to the Google Cloud Platform Console using your Google admin login credentials.
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From the API Manager, search for the following APIs and enable them. For instructions on enabling APIs, go to the Console Help Center website, Activate and deactivate APIs.
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Admin SDK
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Drive API
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Gmail API
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Google Apps Marketplace SDK
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Google Apps Marketplace API
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