Steps to Add API Scopes in G Suite Account

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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.

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After successful login, select the Security option.

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Navigate to API Controls option and click on it.

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

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

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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

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

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