ACI Worldwide Launches Second Generation Electronic Delivery & Payment Solutions AT iEB Conference.

Business Editors\High-Tech Writers

OMAHA, Neb.--(BUSINESS WIRE)--April 2, 2001

ACI Solutions are Unique in their

Direct-to-Desktop and "Pay Biller" Approach

ACI Worldwide (Nasdaq:TSAI), a leading international provider of enterprise e-payment solutions, announces the launch of its second-generation software for electronic statement delivery (ESD) and electronic bill delivery and payment (EBDP)--M-Statement(TM) and M-Bill(TM). With these solutions, companies can create, track and securely deliver content-rich statements and bills directly to their customers via e-mail and other delivery channels. Customers can electronically pay the billing company from within the bills they receive using payment types accepted around the world. Through ACI's "pay biller" approach, billers can readily clear their customer's payments through the corporate financial institution or payment services provider they already use.

"ACI's second-generation solutions are built with an emphasis on delivery as opposed to the first generation of electronic bill and statement solutions that focused on presentment," said Dan Heimann, director of marketing for ACI's electronic delivery and payment solutions. "Consumers are used to having their statements and bills delivered directly to them. Our solutions allow companies to take advantage of that familiarity. Instead of asking customers to surf to an Internet site to see their statements or bills, our software delivers the documents directly to the customer via e-mail, which, according to a PSI study, is the preferred delivery method among U.S. consumers."

ACI's software allows companies to mirror the time-honored model in which they create and deliver bills and statements to their customers. The company controls what its customer receives in terms of branding, style and content of the bill or statement. The complete bill or statement is securely delivered using industry standard encryption to ensure privacy and digital signatures to ensure authenticity. Through patent-pending tracking capabilities, the delivery of bills and statements is ensured. Standard e-mail client and browser software is all customers need to view, manage and interact with the document they receive. The combination of these features makes electronic delivery a viable replacement for paper bills and statements. Companies can achieve real cost savings and a measurable return-on-investment by eliminating the creation and delivery of paper documents for customers who use the service. Content-rich electronic bills and statements can also become interactive vehicles of communication between companies and their customers to improve customer loyalty, increase marketing effectiveness and ultimately improve product and services penetration.

ACI's unique "pay biller" approach allows billers to leverage relationships they already have with financial institutions and payment service providers. Billers using M-Bill can continue to accept the same methods of payment, clear payments via the corporate bank or payment-clearing provider they already use, and utilize existing payment infrastructures and national payment clearing services.

M-Bill is the first solution to provide payment initiation from within an electronic bill. With the click of the "pay biller" button embedded in bills, customers control the payment amount and timing. Once payment is initiated, instructions are generated that the biller can clear electronically through its corporate bank or payment services provider. Electronic payments supported include direct debit mechanisms such as ACH, BACS, GIRO and others. Credit card, debit card or check card-based payments are also supported if the biller, through the services of its corporate bank or payment processor, accepts them.

M-Statement and M-Bill are part of ACI's e-series suite of products. E-series solutions integrate with existing payment systems to support secure Internet payments, wireless and mobile commerce, electronic statement delivery and bill payments, and smart card-based services.

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, paying bills online. Twenty 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 2,400 customers in 78 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 forwarding-looking statements in this press release are subject to a variety of risks and uncertainties. Actual results could differ materially. Factors that could cause actual results to differ include but are not limited to the following.

The acquisition of MessagingDirect is subject to numerous risks, including the following: (i) MessagingDirect is in a highly competitive industry, (ii) MessagingDirect does not have a significant market presence, significant revenues, or widespread acceptance or prolonged use of its products, (iii) MessagingDirect has not been profitable, (iv) the electronic statement presentation and electronic bill presentment and payment markets may not achieve the predicted growth rates, (v) MessagingDirect's products, personnel, and operations may be difficult to combine with those of TSA, the products may not be accepted by TSA's customer base, and there will be significant integration costs of combining the business, (vi) the acquisition will have a dilutive impact on earnings per share and acquisition-related expenses and amortization will have an adverse effect on earnings.

TSA is subject to risks of conducting international operations including: difficulties in staffing and management, reliance on independent distributors, fluctuations in foreign currency exchange rates, compliance with foreign regulatory requirements, variability of foreign economic conditions, and changing restrictions imposed by U.S. export laws.

Fluctuations in quarterly operating results may result in volatility in TSA's stock price. No assurance can be given that operating results will not vary. TSA's stock price may also be volatile, in part due to external factors such as announcements by third parties or competitors, inherent volatility in the high-technology sector and changing market conditions in the industry.

For a detailed discussion of these and other risk factors, interested parties should review TSA's filings with the Securities and Exchange Commission, including Exhibit 99.01 to TSA's Annual Report on Form 10-K for the fiscal year ended September 30, 2000.