At present, insurance needs to be deducted from passbook or savings card. I have never heard of using credit card to buy insurance. As for the industrial and commercial bureau to pay taxes, I have tried to swipe my credit card at the national tax bureau, which is ok, but the industrial and commercial bureau has not tried it. As for the longest interest-free repayment period of your credit card, the average bank is 50 days and some are 56 days. If you want to get the longest interest-free repayment period, then you must first know the billing date of your credit card, and swipe your card on the second day of the billing date to achieve the longest interest-free repayment period of 50~56 days.