Mr. A, who operates a group dining service, used to sell paper meal vouchers and collect
them from customers upon entry. However, due to concerns about the vouchers being
duplicated or damaged, and the recurring costs associated, Mr. A has now opted for a new
meal voucher checking device. This device eliminates the need for issuing paper vouchers by
distributing coin-sized tokens instead. If a customer pre-purchases 30 meals, the token
displays a number indicating 30 meals. Upon entering the restaurant, customers present the
token to a vending machine, which deducts a meal from the token as they enter. The token
can also be recharged for future use. This system eliminates concerns over loss and
duplication of meal vouchers.