Put your 2500 into your credit card first. Log in online to open the online banking of China Merchants Bank, and it is recommended to open the popular version of personal online banking. (There is no need to download the certificate. Set the online consumption limit to 1000, because your overdraft is 1000. Well, you can buy your camera.
In terms of repayment. Log in to your online banking, check your bill date, and then log in to your mailbox to check the bill when your bill date arrives, and you will be notified to repay 1000 yuan. There is a minimum repayment limit, 10%. Does not affect your credit history. Just go to China Merchants Bank for repayment before the repayment date.