While First Data Corp. vows to contest action by the Department of Justice to stop its acquisition of Concord EFS, industry observers say the Denver-based processing giant may have good reason to fight for a stronger position in the market for debit transactions secured by personal identification numbers. The $7.3 …

A Web-based payments transaction processing program has been growing at about 400% annually since it branched out beyond the hospitality industry. When Las Vegas-based Shift4 Corp. developed its $$$ on the Net system for nearby resorts five years ago, the system was designed to allow the hotel, gift shops, casinos, …