In the state of PA, the LTCF is issued by the governing Sheriff's department. You apply to the Sheriff of the county you live in. If you do not live in PA, you must go to the nearest Sheriff's department in PA in person. There is no license by mail anymore.
As a resident you may start the application process by mail (or electronically) but you must appear in person to take your picture and electronically sign your name. For a non-resident, I would call the nearest Sheriff's department to you and ask what their procedures are. It should be similar.
The reason I speak of both resident and non-resident is you didn't say where you were from and you haven't updated your profile to say where you are from.