Different banks have different requirements for credit card applications. Generally, after you get the application form at the outlet, you should fill in the field information of the main card number and the auxiliary card, attach a copy of the ID card of the auxiliary card, sign the names of the main card and the auxiliary card, and finally attach the relationship certificate between the main card holder and the auxiliary card holder.
If you have a credit card, you must pay attention to rational use and timely repayment.