On Tokyo Metro's website there is a 24, 48, and 72-hours ticket, which can be bought from certain stores in Tokyo, and from Narita and Haneda Airport.
My question is this: since tourists can buy the tickets from the aforementioned airports, can I take the metro from either airport to Asakusa Station? (Changing one or two isn't a problem)
I know that there's also NEX and Skyline, but I'd rather take the usual metro mostly for taking pictures.
Also, can I simply scan it, like with Pasmo and Suica, or do I need to show it every time?