1.Lacarra pos Can I use a credit card? It is ok to use Lacarra POS to swipe your credit card, but it is not recommended. Users who use personal credit cards to swipe their cards on their POS machines are likely to be identified as illegal cashing. If it is discovered by the bank, the credit card may be frozen, and bad records will be included in the credit investigation, which has a great impact. Second, POS machine POS(Pointofsales) means "point of sale" in Chinese, which is called the point of sale information management system. It is a terminal reader equipped with bar code or OCR code technology, which has the function of teller of 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. Second, the classification of POS machines According to the communication mode, POS machines can be divided into fixed POS machines and wireless POS machines. 1. Fixed POS machines: merchants suitable for integrated renovation projects. Advantages: (1) Software upgrade and maintenance are relatively easy; (2) Network dialing mode, with fast dialing speed; (3)POS transaction clearing is relatively easy. Disadvantages: (1) needs online operation; (2) guests need to pay at the cashier. 2. Wireless POS machine: it is suitable for merchants who collect money at the guest's residence. Advantages are: (1) wireless operation; (2) Free form of payment place; (3) small size. Disadvantages are: (1) the communication signal is unstable; (2) data is easy to be lost; (3) High cost.