Data room Charging System (I) -- card return operation

When I knocked on the data center, I felt that it was quite simple to return the card and it was completed quickly. However, during the acceptance, there was a problem with it-the card was on the machine and the card could be returned, but it was not processed on the machine. It is still very easy to implement this function again.

I. Sort out ideas

Ii. Summary

In this case, I think it is not comprehensive enough to have a complete idea.

This time, considering whether the card number is on the machine, it is actually a process of downloading,

There should be no problems with the entire process and program writing. Therefore, the idea is very important!

Data room Charging System (I) -- card return operation