I recommend WeChat pay.
WeChat / Weixin is one of the most frequently used social apps & payment systems in China.
Note that when the app is installed outside China, the wallet feature may be absent, although “WeChat is aggressively trying to expand outside China.”
Within China, the wallet can link with a user’s bank card. The wechat wallet features many useful integrations with third party apps and services.
There is also a NEM mini program available which is effectively a NEM wallet within WeChat.