Credit cards
As long as your credit card is a major international one, few problems should arise at department stores, malls, hotels or convenience stores. Small shops and restaurants are trickier, as many still don’t accept any credit cards. If you’re unsure, look for the familiar card stickers near the register or just ask an employee (preferably before ordering anything). Cards are taken in taxis and when buying tickets for JR trains, but not on the Tokyo Metro (except for commuter tickets).