1.POS machines can be cancelled before 24: 00 on the same day.

2. When canceling, the cardholder must swipe the original card to cancel, and the original amount of funds will be refunded, and the card cannot be changed.

3. When canceling, you need to enter the operator administrator password 123456 and the voucher number of the receipt.

Extended data:

Pos machine is a terminal reader with barcode or OCR code technology, which has cash or barter line cashier function. Its main task is to provide data services and management functions for commodity and media transactions and non-cash settlement.

Installed on the credit card and collection network and computer of special merchants, automatic electronic fund transfer can be realized. It supports the functions of consumption, pre-authorization, balance inquiry and transfer, and is safe, fast and reliable to use. It is difficult to obtain basic business information in large-scale transactions.

The introduction of POS system is mainly to solve the blind spot of retail information management. Pos machines are suitable for the top management of large and medium-sized supermarkets, supermarket chains, hypermarkets, large and medium-sized hotels and all retail enterprises.

Baidu encyclopedia -POS machine