Discover Financial Services announced arrangements with 15 companies to return cash-back rebates of up to 2% on Discover platinum cards.

The rebates, double the standard ones on Discover cards, are available from such merchants as Blockbuster, United Airlines, Hyatt Hotels and Resorts, Foot Locker, and Discover Brokerage.

The Discover platinum card, launched several months ago, is to add more partners in the next few months, said Roger Hochschild, executive vice president of Discover Financial Services.

In a separate announcement, Discover said consumers who shop at through the card issuer's Internet gateway-Discover ShopCenter-can earn 7% cash back.

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