OAuth client ID for Google APIs
OptionalclientOAuth client secret (optional for public clients)
OptionalloggerLogger instance
DCR mode: self-hosted (runs own OAuth server) or external (uses Auth0/Stitch)
OAuth scopes to request
OptionalstoreDCR client storage URI (required for self-hosted mode)
OptionalverifyExternal verification endpoint URL (required for external mode)
DCR configuration for dynamic client registration