In official website, China UnionPay Express inquired that China UnionPay Express cannot bind other people's credit cards, but can only bind users' own credit cards to repay for themselves. China unionpay express APP payment provides China unionpay express payment function for merchants' mobile apps. By integrating the China UnionPay Express SDK into the merchant's mobile APP application, users can adjust the China UnionPay Express payment module to complete the payment, effectively ensuring the security and convenience of the payment process.