Ah finally the Western tech ecosystem has caught up with WeChat/Alipay mini programs. https://developers.weixin.qq.com/miniprogram/en/dev/framewor... China had this DSL for building mobile apps for years. Those these apps are initially embedded inside WeChat/Alipay, there are now frameworks that allow it to run outside, like uniapp. https://en.uniapp.dcloud.io/
I've had very limited exposure to Alipay mini-programs (took a daytrip to Shenzhen from HK); but anything I had to touch (couples of restaurant menus; buying tickets for metro) was _screaming_ "this is poorly constructed webpage", not native-like experience. Are there some you would recommend to see as an example of it being done right?
I think there are first party integrations in wechat app, go to Me - Pay and Services, you can see a bunch of them.