ACI To Offer BASE24-es e-Payment Solution On HP-UX Platforms; Agreement with HP Furthers Customer Migration Toward Open Systems Technology.

Business Editors/High-Tech Writers

OMAHA, Neb.--(BUSINESS WIRE)--Nov. 18, 2003

ACI Worldwide (Nasdaq:TSAI), a leading international provider of enterprise e-payment solutions, has signed an agreement with HP to provide ACI's BASE24-es(TM) e-payment software on the HP-UX Integrity Server family.

Representing the next-generation implementation of ACI's world class payments platform, BASE24-es is an integrated solution to acquire, authenticate, route, switch and authorize transactions across multiple delivery channels. BASE24-es allows users to improve profitability, enhance customer experience and service, and improve time to market.

HP-UX 11i v2 offers customers 64-way Itanium(R) processor performance scalability and the mission-critical UNIX capabilities required to handle the demanding requirements of financial industry applications.

Bringing BASE24-es to the HP-UX environment can allow customers to achieve substantial savings in two areas - over in-house applications and by moving to HP's adaptive enterprise environment, thereby enabling possible efficiencies in both platform and operational costs, and in deployment.

With BASE24-es on HP-UX, the companies are investing to bring the best in functions and features to an open systems environment, with an enterprise-scalable architecture.

"Electronic payment systems are entering a revolutionary phase with new payment and channel developments requiring open solutions to support enterprise-wide transaction services," said Mark Vipond, president of ACI Worldwide. "We are teaming with HP to offer ACI's BASE24-es enterprise features within the HP-UX environment in direct response to customer demand."

"Enterprises in the financial services industry are building more agile, open systems-based infrastructures that can help them reduce cost and deliver a better return on IT," said Tim Evans, director payment segment, Financial Services Business, HP Services. "HP is pleased to extend our long-term relationship with ACI to offer ACI solutions on HP-UX to help enterprises further take advantage of open systems-based solutions."

About ACI Worldwide

Every second of every day, consumers are initiating electronic payment transactions accessing their cash at ATMs, using debit and credit cards to make purchases in stores and on the Internet, banking by phone and PC, paying bills online. Over 30 billion times a year, ACI software is used to process these transactions, powering the world's online payment systems. ACI was founded in 1975 and pioneered the development of applications and networking software for online transaction processing. Today more than 500 customers in 73 countries use ACI supplied software. Visit ACI Worldwide on the Internet at www.aciworldwide.com.

Any statements in this press release regarding projected results are preliminary and "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995. In addition, this press release may contain other forward-looking statements including statements regarding Transaction Systems Architects, Inc.'s ("TSA"), its subsidiaries or third parties' expectations, predictions, views, opportunities, plans, strategies, beliefs, and statements of similar effect. The forward-looking statements in this press release are subject to a variety of risks and uncertainties. Actual results could differ materially.

For a detailed discussion of these and other risk factors, interested parties should review the Company's filings with the Securities and Exchange Commission, including the Company's Form 10-K filed on January 13, 2003, the Company's Form 10-Q filed on February 13, 2003, the Company's Form 10-Q filed on May 15, 2003, the Company's Form 10-Q filed on August 14, 2003, and the Company's Form 8-K filed on October 28, 2003.