Customer bill is a statement of consumption provided to customers, which lists the consumption amount information of all products sold under the same payment account under the customer's name to help customers understand the consumption details.

Banks will collect necessary personal information when users apply for credit cards, which is very convenient for banks to review credit card procedures. But if the bank collects unnecessary personal information, then this behavior of the bank has violated the relevant laws of our country. It is worth noting that personal information unrelated to bank debt is not properly protected, but is transferred or sold to "unidentified" people after the credit card user expires, which is undoubtedly an infringement of personal information unrelated to bank debt.