是否可以增加更加灵活的定价方式

As the title suggests, the subscription model with a monthly fee plus 20 yuan is not very friendly to individual users. After all, it is impossible to generate a QR code all the time, and once it is done, it will not be used frequently. For individual users, they basically use it on demand. I guess some people will subscribe to it for secondary sales, and this is not very friendly to developers either. I hope there will be a flexible billing method such as short-term subscription or per-use billing, such as 1 yuan for 20-30 times or 5 yuan for one week. This is just an example, and I hope it can be taken as a reference.