Prio Inc., an Internet company that markets discounts and rewards for shoppers, has built its business through marketing alliances with card companies.

Retailers that enroll in Prio's programs agree to give discounts to customers who buy merchandise on-line or in stores. Customers who enroll in the free service get the discount credited to their card; the Prio system uses the Internet to make sure customers are paid, no matter where a transaction takes place.

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