effective immediately. The credit card master card is the owner of the credit card account, and it can operate and manage the credit card, including card application, activation, credit limit change, bill inquiry, etc. The secondary card is an auxiliary card that the main card holder applies to the bank. The secondary card can use the credit line for consumption under the authorization of the main card holder. The two are closely related. When the holder adjusts the transaction limit of the secondary card, the amount will take effect in real time, and the consumption amount of the secondary card in the current month will be calculated from the date of adjustment. Credit card is a kind of bank card that can borrow and spend money from banks on time.