SF Express pays by credit card, which can be refunded and paid again. Official website of China Postal Savings Bank shows that the transaction using Li Jianjin has been refunded. If the refund is successful, Li Jianjin is still within the validity period and can continue to be used. If the deduction of Li fund has expired when the refund is successful, the amount of deduction of Li fund cannot be refunded. In case of partial refund, the refund will be made in proportion to the order amount. If the exemption is not within the validity period, it will be returned to the service provider or enterprise, regardless of the user. Bank deposit reduction is a preferential activity for offline consumption of users' debit cards. Binding a credit card to the third-party payment platform WeChat, and using WeChat to choose CCB bank card to pay when spending, can reduce the corresponding amount. This is a preferential policy jointly launched by the three banking platforms, which is quite attractive to consumers.