My bank card number 1 I received an overdraft interest of 508 yuan from the SMS, and I also paid the minimum repayment amount. How is the bank calculated? My credit card limit is 30 thousand

If it's a CMB credit card, you don't have to pay in full, but the repayment amount of each installment must be greater than the "minimum repayment amount", which is the basic repayment requirement for you to maintain a good credit record. Minimum repayment amount = 10% advance cash principal+10% non-advance cash transaction principal+100% expense+100% interest+100% excess consumption+100. If "minimum repayment amount" is selected, you cannot enjoy the interest-free repayment period. From the bookkeeping date (usually the day after consumption), interest will be charged on all consumption in the current period, with a daily interest rate of 0.5 ‰ until you pay it off in full. If all the payable amount of this period is paid off before the due repayment date, you can enjoy the interest-free period of consumption. You can choose the repayment method according to the specific situation.