public function newSessionCookie() {
		$this->session_uuid = NULL;

		$request = new Trustly_Data_JSONRPCRequest('NewSessionCookie');
			/* Call parent directly here as we will attempt to detect the
			 * missing session uuid here and call this function if it is not set */
		$response = parent::call($request);

		if(isset($response)) {
			if($response->isSuccess()) {
				$this->session_uuid = $response->getResult('sessionuuid');
			}
		}
		if(!isset($this->session_uuid)) {
			throw new Trustly_AuthentificationException();
		}
		return $response;
	}