2. Generally, there is a machine serial number on the back of the machine, which can also be called SN or terminal number;

3. The terminal number can also be seen inside the machine (consistent with most parts on the back of the machine, except the cutter);

4. You can query the product specifications of pos machines.

The POS background corresponds to the real merchant information, which can directly locate the merchant's store and legal person, mobile phone number and bank card. Free pos, which can be used with brushes.

Extended data:

Fixed-line POS functions include self-service banking services such as credit card repayment and balance inquiry. If you swipe your card on the fixed-line POS machine, you can pay for water, electricity, gas, fixed-line telephone and mobile phone, and you can also book air tickets and hotels on Ctrip.

According to UnionPay sources, the fixed-line payment terminal (fixed-line POS machine) has passed the security test certification of the bank card testing center, and the whole encryption system minimizes the possible financial security risks in the transaction, even more secure than the traditional POS machine.

In addition, the fixed-line payment communication is transmitted by encryption algorithm on the fixed-line private network, that is, a password is used for a transaction, and each terminal is only bound with a unique phone number, so there is no security problem.

Baidu encyclopedia-fixed-line POS machine