POS machines can be handled in Linzhou through various channels, including banks, POS agents, third-party payment companies and so on. Generally speaking, large supermarkets, restaurants and other retail enterprises prefer to choose POS services provided by banks, because the POS services of banks are more stable and reliable, while small and micro enterprises prefer to choose POS services provided by POS agents or third-party payment companies, because the service fees of these two types of institutions are lower.