Generally, when handling personal credit cards, banks must require proof of personal income! This is one of the routine procedures for banks to handle cards, and has nothing to do with all the business activities of the certifying company! It's just that the credit card headquarters will contact the company phone number you provided to confirm whether you are an employee of the company. Therefore, the income certificate issued by your company will not be known by the local local taxation bureau, and even if it is known, it will not be checked, because the income certificate does not represent the actual payment voucher!