Explain how credit cards cash in to earn a profit from the difference in handling fees.

According to the police investigating the case, the suspect mainly earns the difference in handling fees to make a profit. In the first case, customers are in urgent need of cash, but if they use credit cards to overdraw cash, they need to give the bank a 2.5% handling fee; If a criminal gang with credit card cashing is found, the suspect will use his POS machine to swipe the customer's credit card for "shopping". At this time, criminal gangs need to pay 0.5% handling fee to banks, and then take cash to customers, and charge customers handling fees ranging from 1% to 1.7%. After that, the customer only needs to repay the bank normally on the repayment date. In the second case, the customer swiped the card before. If you can't repay the bank by the repayment date, find a criminal gang. The suspect pays the loan by credit card, and the customer only needs to pay the suspect a certain formalities fee. This means that on the one hand, "customers" always refuse to pay back the bank's money, on the other hand, they constantly increase the credit line. For example, you can owe the bank 50,000 yuan at the beginning, and over time you can "depend" on it to 654.38+ 10,000 yuan.