ACI Worldwide Licenses New Payment Solutions to Partecis, BNP Paribas and Natixis Paiements in France.

Partecis Consortium to Deploy BASE24-eps to Modernise Payments Platform and Drive Toward SEPA Compliance

WATFORD, England -- ACI Worldwide (NASDAQ:TSAI), a leading international provider of software for electronic payment systems, today announced a contract to deploy BASE24-eps([R]) software to facilitate and secure payment transactions across the Partecis platform.

Steve Wright, president of ACI Worldwide EMEA, said, "This milestone demonstrates ACI's commitment to the French market with an offering that helps banks and retailers to authorise and authenticate large transaction volumes across the entire range of payment methods."

Partecis (PARTnership for European Card Information System) is the unified transaction and payment platform jointly developed and owned by BNP Paribas and Natixis Paiements. BNP Paribas is one of Europe's largest banks employing 140,000 people across 87 countries worldwide - including 80,000 in Europe. Created in 2006, Natixis Paiements is a partnership between two French cooperative banking groups, Groupe Banque Populaire and Groupe Caisse d'Epargne, to offer a single entity for their respective corporate banking services.

Partecis has been established specifically to support international transactions as a uniform, multilingual, multi-format payment offering to support retail and corporate clients of both banks across Europe, and shall be particularly suited for the Single European Payments Area (SEPA). SEPA is a European initiative to create an environment where all electronic payments are considered domestic, and where a difference between national and international payments does not exist, thus improving the efficiency of cross border payments. The Partecis system is, therefore, ideally positioned to exploit efficiencies and economies of scale generated by SEPA across Europe.

BASE24-eps is an integrated software solution to acquire, authenticate, route, switch and authorise payments across multiple channels. In addition to supporting traditional payment transactions such as debit and credit at the ATM and point of sale, branch banking and telephone banking, ACI's software can also support future transaction methods such as mobile commerce and Internet banking.

Jean-Marie Vallee, directeur general at Natixis Paiements, said, "Our choice of software was principally based on the speed and ease with which we could integrate it across our joint applications."

Gilbert Arira, Monetique manager at BNP Paribas, said, "The Partecis platform will enable us to handle transactions initiated outside France and to offer a service that is genuinely cross-border."

About Partecis

Created in 2006, Partecis (PARTnership European Card Information System) is a 50/50 joint venture between Natixis Paiements and BNP Paribas, to establish a joint payment platform. Through the project, all the processing of electronic banking applications (authorisation servers, card and commercial contract management, operations and anti-fraud systems) are being pooled to enable both groups to enhance their electronic banking performance across all client segments (personal, small business and corporate clients).

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 retail banking, wholesale banking 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 May 11, 2007.