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1. Go to the Google Developers Console.

2. Create a new project or select an existing one. 

3. From the left panel, select APIs & auth.

4. In the list of APIs shown, make sure that the status is ON for the Drive API.

5. Again, from the left panel, select Credentials.

6. Click on Create New Client ID.

7. In the the pop-up, do the following

   1. Select Application Type as Web Application.
   2. Under Authorized JavaScript origins, enter the URL you have entered as the Celoxis URL. (Under Settings > Site. Click on Edit Site Settings). For example https://acindia.acme.com:8843/
8. Click on Create Client ID. 
9. A client ID will be created which you need to paste in the option mentioned below.
    

To add your Google Client ID:

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