ACI Readies Canadian Customers for Interac Chip Card Migration; Customers Prepare for Interac Initiative via ACI's EMV-Compliant Software.

OMAHA, Neb. -- ACI Worldwide (Nasdaq:TSAI), a leading international provider of enterprise payment solutions, today responded to the recent Interac Association decision to have a Canadian chip card infrastructure in place within two years by confirming that two Canadian customers have already licensed EMV-compliant software from ACI. Interac has announced an aggressive plan to offer shared services using chip cards with a target of early 2007 for the first chip transaction. ACI Canada has worked closely with Interac on developing EMV debit specifications and achieving full support of the specifications within ACI's core BASE24 solutions.

"Chip card solutions are a natural extension of our payments processing footprint," said Mark Vipond, president of ACI Worldwide. "Interac's migration to chip card technology represents a significant investment, and our products will enable Canadian financial institutions take advantage of this investment with proven, low-risk technology."

ACI provides application software and technical consultancy based on its extensive experience with EMV solutions around the world. The range of ACI's EMV-enabled software supports transactions initiated at multiple delivery channels, from ATMs and point-of-sale devices to wireless telephones and PCs connected to the Internet. ACI has added new features to its BASE24 and BASE24-es(TM) payment solutions to support the processing of EMV authentication and maximize our customers' existing payments infrastructure. These products, along with the ACI Card Management System(TM) and ACI Smart Chip Manager(TM), support the issuance and management of both magnetic stripe and chip cards, easing the migration to full EMV support.

"ACI's experience with other EMV initiatives provides our Canadian customers the opportunity to leap ahead of the curve in supporting EMV transactions," said David Grindal, director of sales support and marketing at ACI Canada. "Our BASE24 products support the EMV specifications for both the Canadian debit and credit markets, and our value-added products help customers manage the issuance of chip cards. We offer proven solutions to help customers fully participate in the Interac initiative."

About ACI Worldwide

Every second of every day, consumers are initiating electronic payment transactions--getting cash at ATMs, using debit and credit cards to make purchases in stores and on the Internet, banking by phone and PC, and paying bills online. Over 45 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 79 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 December 14, 2004, and the Company's Form 10-Q/A filed on February 18, 2005.