Discover Financial Services said Monday that it has extended its network agreement with Wal-Mart Stores Inc. through 2015.

Discover, of Riverwoods, Ill., has handled transactions for the Wal-Mart Discover card since early 2005. The cards, which are treated as a private label card when used at Wal-Mart stores and as Discover cards elsewhere, are issued by General Electric Co.'s GE Money Bank.

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