1. Go to https://console.cloud.google.com and login with your google/gmail account.
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2. Click on Create Project, enter project details, click on Create button.
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3. Now go to project settings
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4. Now go to APIs & Services Dashboard
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5. Now click on Enable APIS and Services
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6. Now enable 2 APIs, Google+ API and Google People API
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7. Now click on Credentials then click on Create Credentials then click on API Key
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8. On this screen select External user type and click on Create button
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9. Now click on OAuth consent screen link and enter details then click on Save button.
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10. Now click on Credentials then click on Create Credentials then click on OAuth Client ID
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11. Select web application option, for Authorized redirect URIs enter your website URL followed by /login/gmail then click on Create button.
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12. Now you can send this application for verification, for that click on OAuth consent screen link then click on edit your app link
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13. On this screen verify details and click on Submit for Verification button
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14. Enter required details and click on Submit button
15. Now click on Credentials link copy API key and save it in website settings on your website.
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16. Now click on OAuth Client IDs edit icon and copy Client ID and Client Secret save them in website settings on your website.
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