Any user, whether a resident or not, can park for 15 minutes for free.
You must get a ticket, which will only be valid for one day and one town. Once you have obtained a ticket for 15 minutes, you cannot get a new one in the same town until the next day.
If you wish to park for more than 15 minutes, you cannot use the specific 15-minute parking spaces, which are only for this service. If you wish to stay for a longer period of time, you should park in any other parking space in the general blue zone.