Aside from using Apple Pay in stores, apps, and for online purchases, another method of using the service is with Transit cards. Currently, Apple Pay Transit works in selected cities in Japan, the UK, US, Russia and China, the latter of which might be seeing some welcome additions very soon.
The transit feature is only available in Guangzhou at the moment, with the UnionPay cards. Code found in iOS 11.3 beta 4 suggests that the feature is going to expand to Beijing and Shanghai in the near future, although initially in beta.
We’re not sure what beta means in this instance, but it’s very clear that Apple is ready to start testing the feature for Shanghai and Beijing Transit Card users.