Is there a mobile phone app with automatic billing? You don't need to enter the amount, and you can automatically deduct the fee after paying?

There is no such APP on the market at present. According to your description, only Alipay, WeChat Pay and major bank apps can do it.

Payment involves all kinds of personal information and security. If there is such a powerful APP that can read all your bank information and consumption information, it is still terrible. If the application software has such software, it is also necessary to check whether the license and operation qualification are complete.

Hope to adopt