Processing for Internet banking contributed to better-than-expected earnings at Fiserv Inc. in the first quarter, but the company is proceeding cautiously into electronic commerce.

The data processor's Internet businesses, which involve sales of front-end Internet banking software and processing of online banking transactions, is generating revenue at an annual rate of $50 million this year, compared with about $15 million last year, said Leslie M. Muma, chairman, president, and chief executive officer of Fiserv in Brookfield, Wis.

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