PushedAuthorizationRequiredException
class PushedAuthorizationRequiredException(message: String, cause: Throwable? = null) : AuthorizationCodeFlow.PushedAuthorizationException
Thrown by start when PAR is required by the authorization server (require_pushed_authorization_requests) but cannot be used — either no PAR endpoint was discovered, or the PAR request itself failed and fallback is not applicable because the server mandates PAR.