Steps to Add API Scopes in G Suite Account

STEP 1

Then go to Admin Console and you will be redirected to the browser where you have to login using the source/destination Admin Email ID.

Google Cloud Console login

STEP 2

After successful login, select the Security option.

Create Project

STEP 3

Navigate to API Controls option and click on it.

APIs & Services option
STEP 4

From Domain-Wide Delegation section, select "MANAGE DOMAIN-WIDE DELEGATION".

select dmg file

Under the Domain-Wide Delegation screen, click on "Add New".

select dmg file
STEP 5

Enter the Client ID that you copied while creating Google Cloud Console Project and add below permissions in "OAuth Scopes(comma-delimited)" field as shown below:

G Suite as Source

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,
https://www.google.com/m8/feeds,
https://www.googleapis.com/auth/drive.readonly,
https://www.googleapis.com/auth/drive.metadata.readonly,
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

G Suite as Destination

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,
https://www.googleapis.com/auth/drive,
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

Service account key
STEP 6

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

New service account

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