機器
bill
buy
cashless
cell
cellphone
center
checkout
commercial
connect
convenient
currency
department
easy
economic
electronic
expense
female
girl
hold
male
mall
man
method
mobile
money
nfc
payment
people
phone
point
pos
purchase
qr
retail
rfid
share
shopping
smart
smartphone
spend
store
sync
technology
terminal
transaction
transfer
two
waiter
woman