| 摘要 |
A system determines whether purchase history information of a customer satisfies a credit balance increment condition with reference to a first storage that stores the purchase history information of the customer. If the purchase history information satisfies the credit balance increment condition, the member store calculates a credit balance increment rate on its own risk. The member store approves a payment by the credit card when the requested payment price is lower than the product of the credit balance by the credit balance increment rate even if the requested payment price is higher than the credit balance.
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