You will need your passport (number and country) and a credit card in your name.
Narita (Terminals 1, 2, 3), Haneda (Terminal 3), and Kansai International . Major Stations: Tokyo, Shinjuku , Shibuya, Osaka , and Kyoto . how to buy jr pass in japan
You can purchase the pass directly at select major JR stations and international airports, though this is often roughly than buying through an overseas agent. You will need your passport (number and country)
Major "Travel Service Centers" or ticket offices (Midori-no-madoguchi) at: Haneda (Terminal 3)