Returns information about a registered client, based on its ID.
OptionalregisterRegisters a new client with the server. The client ID and secret will be automatically generated by the library. A modified version of the client information can be returned to reflect specific values enforced by the server.
NOTE: Implementations should NOT delete expired client secrets in-place. Auth middleware provided by this library will automatically check the client_secret_expires_at field and reject requests with expired secrets. Any custom logic for authenticating clients should check the client_secret_expires_at field as well.
If unimplemented, dynamic client registration is unsupported.
Stores information about registered OAuth clients for this server.