This API enables the usage of Google Admin API. In order to enable it, you will need to create an account service private key JSON file and copy its content.
Follow the steps here to create such a private key and authorize the API for usage: [https://developers.google.com/admin-sdk/directory/v1/guides/delegation](https://developers.google.com/admin-sdk/directory/v1/guides/delegation)

It is necessary to authorize the next APIs for that service account:

[https://www.googleapis.com/auth/cloud-platform](https://www.googleapis.com/auth/cloud-platform)

[https://www.googleapis.com/auth/cloud-vision](https://www.googleapis.com/auth/cloud-vision)

Further API access for your Google Cloud ressources are not needed for this API to work.