As part of its China Apple Pay rollout, Apple sent this note out to developers:

You can now support Apple Pay for your customers in China, providing an easy, secure, and private way for them to pay using their China UnionPay credit and debit cards. Apple Pay lets users pay for physical goods and services such as groceries, clothing, tickets, and reservations within your iOS apps.

Big step for Apple Pay, potential opportunity for developers, if they have the ability to build/localize for that market.