There are three reasons why credit cards automatically deduct money from supermarkets every month.

1. After overdraft consumption, it will be automatically deducted from the balance on the repayment date.

2. The credit card used needs an annual fee, which will be automatically deducted from the balance after it expires.

3. Some banking services have been opened, and the payment will automatically expire and will be deducted from the balance; For example: SMS reminder service.