private function getSellsyInstance(): Sellsy
    {
        $sellSy = new Sellsy('', '', '', '', '');
        $transport = new class implements TransportInterface {
            public function createUri(): UriInterface
            {
            }

            public function createRequest(string $method, UriInterface $uri): RequestInterface
            {
            }

            public function createStream(array &$elements): StreamInterface
            {
            }

            public function execute(RequestInterface $request): ResponseInterface
            {
            }

        };
        $sellSy->setTransport($transport);
        //To prevent case issues from the inconsistent documentation
        $sellSy->AccountDatas();
        $sellSy->TimeTracking();

        return $sellSy;
    }