Configure authentication for the Google Cloud Spanner connection using a Google Cloud service account.
| Field | Required/Optional | Description |
|---|---|---|
| Authentication method | Required | Select Regular to provide a service account key directly, or Key Vault to retrieve it from a key vault. |
| Service account key | Required | The contents of the Google Cloud service account JSON key file. The service account must have the roles/spanner.databaseReader IAM role on the target Spanner database. |