The machine is clearly bound to its own bank card and has its own independent background. You can log in to the background of the system with a computer and check all your transaction details.

The second clearing machine is bound to someone else's bank card. When the money arrives, he will transfer it to you. This is the most dangerous. He will transfer it to you when the initial amount is small. You are also stupid enough to think that your card is bound when you see the account. When the amount is huge, he will stop transferring money to you.

Extended data:

POS(Pointofsales), which means "point of sale" in Chinese, is called point of sale information management system. It is a terminal reader equipped with bar code or OCR code technology, which has the function of cashier in cash or barter bank. Its main task is to provide data services and management functions for commodity and media transactions, and to carry out non-cash settlement.

POS is a multifunctional terminal. It can be installed in special merchants and acceptance outlets of credit cards, and connected with computers to realize automatic transfer of electronic funds. It has the functions of supporting consumption, pre-authorization, balance inquiry and transfer, and is safe, fast and reliable to use. It is difficult to obtain basic business information for bulk transactions, and the introduction of POS system is mainly to solve the blind spot of retail information management. An important part of chain branch management information system.

References:

Baidu encyclopedia -POS machine