First, you'll need to get a Google Client ID. Follow these steps:
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Visit https://code.google.com/apis/console/
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If necessary, "Create Project"
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Open the "API Access" tab
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Create another Client ID
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Click "Edit settings…"
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Set Authorized Redirect URIs to: {{siteUrl}}_oauth/google?close
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Set Authorized Javascript Origins to: {{siteUrl}}
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Create client ID