POS machine refers to the abbreviation of "PointofSale", that is, point-of-sale terminal, also known as credit card reader, cash register and so on. It is an electronic device, which can realize the settlement and record of transactions by inserting payment tools such as credit cards or debit cards. In daily life, POS machines have become an essential tool for businesses. However, for ordinary individuals, can I apply for a POS machine? In view of this problem, this paper will discuss it from the following aspects.