For those with Discover, make sure you bring that Wallet Card! I was traveling with a colleage in Beijing recently who had Discover and kept running into problems without the Wallet card. The way it was explained to me is that most Chinese businesses have two card swipers -- a China Union Pay machine and an International Card machine. Here's the catch -- Discover is considered China Union Pay, not interational; thus, you can use it almost anywhere you can use a CC (note, that isn't in too many places), but you have to make sure it is swiped as CUP.