public function registerInterfaceBindings(Application $app)
    {
        $app->bind(ClientInterface::class, FluentClient::class);
        $app->bind(ScopeInterface::class, FluentScope::class);
        $app->bind(SessionInterface::class, FluentSession::class);
        $app->bind(AuthCodeInterface::class, FluentAuthCode::class);
        $app->bind(AccessTokenInterface::class, FluentAccessToken::class);
        $app->bind(RefreshTokenInterface::class, FluentRefreshToken::class);
    }