① Domestic credit card swiping and supplementary card online transactions, and banks send reminder messages (or WeChat, Pocket Life, Alipay, etc.). ) to the supplementary cardholder's mobile phone (or WeChat account, Pocket Life, Alipay, etc. Default real-time binding supplementary card holders); If the secondary cardholder's mobile phone number is invalid, it will be automatically sent to the primary cardholder's mobile phone (or WeChat account, Pocket Life, Alipay, etc. Bound by the host card holder). \x0d\② For overseas credit card swiping transactions of supplementary cards, by default, the bank sends transaction reminder messages (or WeChat, Pocket Life, Alipay, etc.). ) at the same time sent to the main and deputy cardholders' mobile phones. If you don't bind WeChat, you won't be able to receive consumption reminders. In the case that the registered mobile phone numbers of the main cardholder are the same, only the WeChat account bound by the supplementary cardholder can receive the consumption reminder.