Parents, is it SF Express? When SF sends out an express, it will record the cell phone number of the recipient of the express to send to Alipay, the Alipay system to match the cell phone number of the most commonly used Alipay account, find the account will pay attention to the SF service window and send a message to the user that the courier has been sent, the subsequent user can check the progress of the express related to the SF through the service window.