As I understood, the WeChat payments is not what is used to pay for the meal. I assumed person A would pay for the meals of other people, then they would pay to

As I understood, the WeChat payments is not what is used to pay for the meal. I assumed person A would pay for the meals of other people, then they would pay to a directly A via WeChat. For the restaurants, admittedly I have not been in China. I live in Bangkok and here are loads of "street food" and "mom & pops" restaurants. I just assumed it was similar in China, the examples you have Beijing/Shanghai is also huge and quite modern iirc. What about other cities, outskirts or restaurants people eat for daily meals? (If that's a thing there).