There are actually two versions of Japanese travel credit card, one is UnionPay single label and the other is JCB single label. Obviously, it is no problem to use China UnionPay card in China. Just put RMB in and repay it in RMB. JCB brand Japanese travel cards can be used by overseas JCB merchants and JCB machines, but domestic JCB networks and UnionPay networks are not supported.