Press Release

(Watford, England. – 2 May 2007) – ACI Worldwide (NASDAQ: TSAI), a leading international provider of enterprise payment solutions, today announced that Unity Bank Plc, a leading West African bank based in Abuja, Nigeria, has selected ACI Proactive Risk ManagerTM software to automate its procedures in order to comply with the national Money Laundering Prohibition Act of 2004. Unity Bank is the third major bank in Nigeria to license this technology from ACI. Access Bank plc and Zenith Bank plc have also licensed Proactive Risk Manager.

Unity Bank selected ACI to supply its Proactive Risk Manager system for Anti-Money Laundering, as the software is able to detect suspicious activity quickly, render threshold reports to the Nigerian Financial Intelligence Unit (NFIU) in an acceptable format, and effectively use neural networks, rules-based strategies and workflow management software.   The solution is modular in design, so it can be expanded to include monitoring for issuer fraud and managing risk across the enterprise, with an account-based view of transactions.   

Lamis Shehu Dikko, executive director risk management & control of Unity Bank Plc, said, “It is vitally important that we protect our solid reputation as a financial partner in the niche markets we serve.  The selection process to find a partner that has the experience of implementing a world-class solution to meet our stringent objectives was exhaustive.  We were impressed with ACI’s outstanding track record as a strategic technology partner to the world’s leading financial institutions for the last 30 years.  The Proactive Risk Manager solution offers a cost-effective and rapid deployment to meet the reporting requirements of the NFIU.  In addition, ACI has multiple users of this technology in our country, which will enhance the overall level of support.”  

Steve Wright, president of ACI Worldwide EMEA, said, “We now have three major Nigerian Banks that have invested in our ACI Proactive Risk Manager technology.  This is a strong vote of confidence in ACI and our commitment to this important market.  We welcome Unity Bank as a customer and look forward to a long and mutually satisfying relationship as a payment technology partner to this highly innovative and progressive bank.”

About Unity Bank

Visit Unity Bank on the Internet at www.unitybankng.com

About ACI Worldwide

Every second of every day, ACI solutions are at work processing electronic payments, managing risk, automating back office systems and providing application infrastructure services.  Founded in 1975, ACI is a leading international provider of solutions for consumer and wholesale banking, retail and cross-industry systems.  ACI serves more than 800 customers in 84 countries including many of the world's largest financial institutions, retailers and payment processors.  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, 2005, the Company’s Form 10Q filed on February 9, 2006, the Company’s Form 10Q filed on May 10, 2006, and the Company’s Form 10Q filed on August 9, 2006.