Well, I tried it today and it works! The cashier just kind of looked at it and was not sure what to do and had to call a supervisor. I had printed off of the Discover website the page showing in Chinese describing how to process the card and showing the UnionPay logo. They looked at it and I convinced them to give it a try. It worked much to their surprise. I will post back later once it posts to my account with the exchange rate given. I have learned though that UnionPay is the most widely accepted card in China and noticed the logo in all kinds of places and shops.