Online banking of our bank is divided into public version of personal banking and professional version of personal banking. Professional online banking requires me to bring my ID card and a card to the counter, which will give you a hardware similar to a USB flash drive. At present, only credit cards (including credit card supplementary cards) cannot be applied directly.
The public version of online banking can log in with the information of the cardholder of the secondary card, but because the cards share the credit limit of the primary card, there is no information about the secondary card.