Legal. Because this practice conforms to the provisions of the Banking Supervision Law of the People's Republic of China and the General Principles of Loans, it ensures the legal use and transparency of borrowed funds. This provision helps to prevent the abuse of loans and protect the rights and interests of consumers and lending institutions. At the same time, asking for payment vouchers will also help banks or financial institutions to supervise and audit and ensure the correct flow of funds. Therefore, it is legal for Huimin to provide payment vouchers within 5 days.