If the amount you repay meets the "minimum repayment amount" (you can't enjoy the interest-free repayment period), interest will be charged on all consumption in the current period from the bookkeeping date (usually the day after consumption), with a daily interest rate of 0.5 ‰ until you pay it off in full.
(You can consult the credit card service information of China Merchants Bank online through QQ or WeChat. Method 1: Search 4008205555 among QQ corporate friends, and add China Merchants Bank Credit Card Center as a friend; Method 2: Search for "cmb4008205555" on WeChat, and pay attention to China Merchants Bank Credit Card Center)