The Portugal Passenger Locator Card is issued at the port of arrival. Once at the port, you simply fill in your details on the card and present it on the counter. As long as you return to Lisbon via Barra, you can travel to any other part of Portugal. For example, if you entered via Barra for your flight back to Lisbon you would not need to show your port of entry again to travel to the northern region of Portugal (