@Override
	public List<String> logInBuyer(String name, String passwd) {
		loggerMediator.info("Log in buyer " + name);
		
		List<String> serviceList;
		stateMgr.setBuyerState();
		serviceList = stateMgr.getServiceList(name);

		if (serviceList!= null && !serviceList.isEmpty())
			if (!logInUser(name, passwd, UserTypes.buyer, serviceList))
				return null;

		return serviceList;
	}