Due to the unique nature of electronic payment, it is difficult for both parties to verify the identity of each other, and key transaction data is easily stolen during network transmission, which leads to low user trust in electronic transactions and hinders large-scale promotion; in addition, There are different interface standards for "FPS" by various banks and it is difficult for merchants to connect banks one by one. On the basis of not compromising the convenience, "Hong Kong Intelligent Cashier" leverages on the Hongkong Post e-Cert (server) to establish a secure and encrypted connection channel between the business collection application and the banking system, providing the highest level of security for electronic payments; At the same time, "Hong Kong Intelligent Cashier" connects to the back end of each "FPS" supporting bank, and supports the company to receive money through the "FPS" in real time (T+0). The money is instantly transferred to the registered bank account designated by the merchant and received instant receipt notification, the merchant can check historical transaction records anytime and anywhere, thus improve and strengthen the legality, security and consistency, making the overall experience of electronic payment more stable and reliable, conducive to non-contact epidemic prevention and control, and daily face-to-face transaction can be done using the "Hong Kong Intelligent Cashier" app with the "Hong Kong Intelligent Cashier" logo, which is the best choice for contactless charging and a good facilitator for smart transactions.