PROBLEM TO BE SOLVED: To perform credit payment without significantly changing the existing credit payment mechanism, and to reduce the risk that the card data is known to a third party. SOLUTION: In the payment system, a receipt server 30 including a storage means, a second acquisition means, first and second notification means, and a POS terminal 10 including first and third acquisition means and a request means. Equipped with. The storage means stores the cooperation code in association with the user code. The 1st and 2nd acquisition means and the 1st notification means notify the credit server 40 of the cooperation code linked|related with the user code regarding the user who performs payment in a memory|storage means. The second notification means, the third acquisition means and the request means notify the user of the identification code notified from the credit server 40 in response to the above notification, further acquire the identification code, and The credit server 40 is requested to make a credit payment together with the notification of the identification code. [Selection diagram] Figure 1
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