How to use the red envelope of Qunar.com?

It's like this. For example, you received a 3 yuan red envelope from Qunar. When you book a hotel order through Qunar.com and check in, after you check out, you log in to Qunar.com to find the corresponding order, and click Apply for Cash Back. For example, if your order is 188 yuan, then applying for cash back tells you that you can cash back 66 yuan to the balance. If you withdraw cash, you will generally deduct a cash withdrawal fee of 5 yuan, and then your red envelope will be reduced by 234 yuan. The balance is withdrawn to the bank card very quickly, and it will arrive in about ten minutes.