Give a few common examples:

1. If a relative is hospitalized or buys medicine, he will give you cash to pay at the hospital payment window, and you can pay by credit card.

2. Pay the phone bill in the business hall. You pay by credit card and accept other people's cash.

3, supermarkets, electrical stores to buy things, you pay with a credit card, receive cash from others.

4. The customer gives you the insurance premium in cash, and you help the customer pay the insurance and swipe the credit card.

These are the most common passing behaviors. These practices are equivalent to: you withdraw money from your credit card, and the bank can't know that these "cashing out" behaviors are still free.