Abstract: The present disclosure proposes a server for customer management. The server according to the present disclosure may include a processor and/or a memory. The processor may process a payment by a first user based on payment information, generate evaluation tag information including an evaluation tag to be displayed at a first terminal, deliver the evaluation tag information to the first terminal, acquire information indicating a third evaluation tag selected by the first user from the first terminal, deliver statistical information including the number of users who have selected the evaluation tag to a shop terminal, acquire information indicating a customer management message and a coupon to be sent to a user who has selected a predetermined evaluation tag from the shop terminal, and deliver the information indicating the customer management message and the coupon to the corresponding terminal.

Abstract: The present disclosure proposes a server that supports payments of a plurality of users. The server may acquire first payment information from a first terminal, request a payment server to process a first payment, deliver sales information and payment status information to a shop terminal and terminals of the remaining users, deliver the payment status information to the first terminal, acquire second payment information from a second terminal, request the payment server to process a second payment, deliver updated payment status information to the terminals, deliver a first notification indicating that the payment of the total amount has been completed to the shop terminal, acquire a second notification indicating confirmation of the payment completion from the shop terminal, and deliver a third notification indicating confirmation of the payment completion to the terminals of the plurality of users.