National City Corp., has become the first customer of Visa U.S.A.'s debit processing service.

Following a pilot, National City was hooked up to Visa's service in mid- March. The Cleveland-based bank has more than 500,000 Visa check cards, accounting for about one million transactions each month, Visa said.

The service, which Visa describes as a "single-connectivity debit processing platform," was launched in November.

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