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

Article 20 The longest interest-free repayment period is 60 days. Cardholders can enjoy an interest-free repayment period by repaying all the used bank funds before the due repayment date, without paying interest on non-cash transactions. If the cardholder has difficulty in repaying all the money used by the bank before the due repayment date, he can repay according to the minimum repayment amount stipulated by the issuing bank.

Extended data:

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

Article 35 Investment behaviors of commercial banks such as wealth management products, trust and investment plans, securities investment funds, asset management plans of securities companies, asset management plans of fund management companies and subsidiaries, and asset management products of insurance asset management institutions.

Financial institutions shall not accept and provide any direct or indirect, express or implied credit guarantee from third-party financial institutions when conducting repurchase (resale) and inter-bank investment business, unless otherwise stipulated by the state.

Article 36? When conducting inter-bank business, financial institutions shall abide by national laws, regulations and policies, establish and improve corresponding risk management and internal control systems, follow the principles of voluntary consultation, honesty and self-discipline, and bear their own risks, and strengthen internal supervision and inspection and accountability.

Baidu Encyclopedia-Bank Card Management Measures