Project Creation, Enable API Access in Google Cloud Console
& Add Scopes at Domain Level

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Go to the cloud platform https://console.developers.google.com/ and Sign in

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After successful sign in, home screen comes up. Go to IAM & Admin & select the NEW PROJECT option.

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Enter the project name and click on Create button to generate new project.

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Go to the Navigation Menu from the left hand side. Then click on the APIs & Services and select Credentials

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Click on Create Credentials and from the dropdown list, select Service account option.

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Create Service account & Enter service account details i.e. Service account name, Service account id, Service account description. Then, click on Create.

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Now, grant service account permissions for that click on the Select a role option. Choose Project >> Owner from drop down. After that click on Continue

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The third step is (optional) which is to "Grant User Acceess to this user account"

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Go to the Navigation Menu from the left hand side. Then click on the APIs & Services and select Credentials. Now created '"Service Account" will be displayed in the list and then click on Edit service account option:

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Service account details screen would be displayed, then click on Keys tab in same page. After that click on Add key >> Create new key and Select an option P12 from key type and click on Create button:

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After successful creation, Private Key will be downloaded in your computer (Save this file securely as it will require for migration). A message will prompt, “Private Key saved to your computer” click on Close:

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Now go to Menu > APIs and Services > Library. Now open and Enable each library as given below:

1. Admin SDK API
2. Google Drive API
3. Gmail API
4. Google Calendar API
5. Google People API

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Enable Google Drive API

Enable Gmail API

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Enable Google Calendar API

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Enable Google People API

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Go to Google Admin console https://admin.google.com/ and sign in with admin account:

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After successful login, Go to Menu Bar. Click on Security and select API Control from drop-down

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API Controls screen would be displayed, then click on MANAGE DOMAIN WIDE-DELEGATION in Domain-wide delegation window:

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Domain-wide delegation screen would be displayed, then click on “Add new” button:

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Add a new client ID screen would be displayed, then enter earlier created Client Id (Prefer Step10 from project creation steps) in “Client Id” field and add below given permissions in “OAuth Scopes(comma-delimited)” fields:

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G Suite as a Source:

https://www.googleapis.com/auth/admin.directory.user.readonly,
https://www.googleapis.com/auth/admin.directory.userschema.readonly,
https://www.googleapis.com/auth/admin.directory.rolemanagement.readonly,
https://www.googleapis.com/auth/drive.readonly,
https://www.googleapis.com/auth/drive.metadata.readonly,
https://www.googleapis.com/auth/gmail.readonly,
https://www.googleapis.com/auth/gmail.labels,
https://www.googleapis.com/auth/calendar.readonly,
https://www.googleapis.com/auth/calendar.events.readonly,
https://www.googleapis.com/auth/calendar.settings.readonly,
http://www.google.com/m8/feeds

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G Suite as a Destination:

https://www.googleapis.com/auth/admin.directory.user.readonly,
https://www.googleapis.com/auth/admin.directory.userschema.readonly,
https://www.googleapis.com/auth/admin.directory.rolemanagement.readonly,
https://www.googleapis.com/auth/drive,
https://www.googleapis.com/auth/gmail.insert,
https://www.googleapis.com/auth/gmail.labels,
https://www.googleapis.com/auth/calendar,
https://www.googleapis.com/auth/calendar.events,
https://www.google.com/m8/feeds

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After successful authorization, above entered details will be added and shown in list as given below

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