ID of the Service Account you have created (shown as client_email
in the generated JSON file, SDK v3+ tokens only).
Optional expiration in seconds for the generated token. Defaults to 3600 seconds (SDK v3+ tokens only).
Private Key for signing the token (SDK v3+ tokens only).
Optional ID of the private key to obtain kid header in the issued token (SDK v3+ tokens only).
Google Firebase Secret. (SDK 2 only).
Google Firebase addon configuration.