| 摘要 |
When a group purchasing application according to a group of a predetermined number of persons is received, a group purchasing key that identifies the group is issued. When a product purchasing procedure request having the group purchasing key is received from a user, a payment processing is carried out at a normal price without a discount, and a product shipping processing is carried out. After the purchasing procedure processing for all users in the group is completed, a discount amount according to the group purchasing is calculated, and a discount amount payback processing is carried out.
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