The following optional config fields are available:
project - The Google Cloud Project telemetry is sent to if the gcp.project.id resource attribute is not set. If unspecified, this is determined using application default credentials.
scopes - The oauth 2.0 scopes requested by the extension.
quota_project - The project for quota and billing purposes. The caller must have serviceusage.services.use permission on the project.
token_type - The type of generated token. Default: access_token