American Express Enters China

I came across this article on American Express and their entry into the Chinese market:

https://www.marketplace.org/2018/11/12/world/american-express-might-be-too-little-too-late-china

This should be a big move for American Express until you look at how consumers pay for goods and services in China.  For the Chinese, using a smartphone is a popular way to pay.  Yes, in China smartphones double as credit cards.  While this hasn't taken off in North America where credit cards are still popular, I see an opportunity for American Express.  All they'd have to do is launch a mobile/smartphone pay app in China.  Considering that American Express has a number of other strengths such as excellent customer service, maybe a few changes to their current offerings could bring them more success in the Chinese market?