| 摘要 |
A method for providing a cash-back service in a cash-back system is provided to apply cash-back to a payment price in real-time, reflect a return amount to the payment price by calculating the return amount for the payment price settled through an event such as lottery, and calculate the return amount for the paid amount. A main server registers a unit amount and a cash-back rate when a member shop is registered. A member shop terminal transmits the payment price and member shop information to the main server in response to a payment request of a customer(220). The main server assigns a lottery chance to the customer as many as the quotient of the payment price by the unit amount. The main server determines ranking of each lottery change. The return amount corresponding to the determination ranking is calculated by considering the cash-back rate and is transmitted to the member shop terminal(230). The member shop terminal pays cash of point corresponding to the returned amount to the customer(240). |
