| 摘要 |
A transaction server may enable users to purchase goods and services from vendors, and may receive and fulfill coupons applied to the transactions. In some scenarios, the transaction server may only accept one coupon per transaction, or may accept multiple coupons for a transaction that are separately and independently applied to the transaction. However, in other scenarios, a coupon may alter the effect of another coupon on the transaction (e.g., doubling a discount presented by another coupon). Accordingly, the transaction server may be configured to apply a base coupon to the transaction, and alter the effect of the base coupon on the transaction according to an auxiliary coupon. In many such scenarios, the transaction may involve individuals in a social network (e.g., a user presenting the base coupon, and an individual in the user's social network presenting the auxiliary coupon in order to participate in the same transaction). |
