How to use the micro-credit Change tutorial

1, this micro-letter change must have two conditions, one is that you use the shop can use micro-letter payment, and then you give him 1 bar. Test with

2, the salesperson did not directly find cash, but printed a "micro-letter change Small ticket", printed on the two-dimensional code and change amount, open micro-letter scanning small ticket on the two-dimensional code, pop-up a 1 yuan "micro-letter Red Envelopes"

3, so you can receive change, in fact, small make up feel so complicated, directly to a small red envelope is OK.