The Measures for the Administration of Bank Cards have corresponding provisions on this:

Thirty-ninth electronic information generated by various transactions such as deposit and withdrawal, transfer and settlement. , handled by the issuing bank according to electronic information such as passwords, which are valid vouchers for this transaction.

The issuing bank can use the transaction details or list as accounting vouchers.

The original vouchers of all kinds of bank card networking transactions shall be kept for at least two years for future reference.

Extended data:

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Relevant laws and regulations of the Measures for the Administration of Bank Cards:

Article 63 A card-issuing bank shall establish a credit management system for credit cards, conduct dynamic management according to the credit status and card usage of cardholders, and notify cardholders in a timely manner in an agreed manner, and may require cardholders to confirm the source of repayment or provide guarantee when necessary.

With the consent of the China Banking Regulatory Commission and its relevant agencies, commercial banks shall make announcements through various channels such as online announcements, bank websites, customer service hotlines, electronic banking, etc. The announcement period shall not be less than 90 days from the date of announcement.

Article 64? All kinds of bank cards issued by commercial banks (or financial institutions) in People's Republic of China (PRC) shall meet the technical standards stipulated by the state, except those with the logo of international credit card organizations.

Baidu Encyclopedia-Bank Card Management Measures