Eight New Customers Choose e-Statement and e-Bill Delivery Solutions From ACI Worldwide; Multiple Markets Highlight ACI Product Flexibility.

Business Editors & Technology Writers

OMAHA, Neb.--(BUSINESS WIRE)--Oct. 29, 2001

ACI Worldwide (Nasdaq:TSAI), a leading international provider of enterprise e-payment solutions, announces the continuing worldwide adoption of its secure document delivery software. Eight new customers in a variety of industries have recently licensed e-Statement Courier(TM) and e-Billing Courier(TM) to electronically deliver bills and statements and offer electronic payment options.

The new customers include:

-- Commerce Bank and Trust, Topeka, Kansas, USA

-- Central Technology Services, Jefferson City, Missouri, USA

-- Mobile2Meter, Dublin, Republic of Ireland (provides payment services and
solutions to the parking management industry)

-- ASPeCT, Johannesburg, South Africa (application service provider (ASP))

-- Comet Technology, Ltd., London, England, (international ASP and Internet
service provider)

ACI's e-Statement Courier and e-Billing Courier enable companies to securely deliver statements and bills directly to their customers' e-mail inboxes. The solutions employ industry-standard encryption and digital signature capabilities to ensure that documents are authentic and private. The delivery of bill summary and detail information including images of entire bills is supported, complete with interactive links to information on new product and service offerings or links to payment services and customer care Web sites. ACI's unique tracking and archival capabilities give companies the ability to accurately track the status of each document, including up-to-date details of when a message was submitted, relayed, delivered, viewed and acted upon. The ACI system uses the latest open standards and is scalable to handle high-volume document delivery.

"Companies choosing our software are plugging into the power of the Internet to connect with their customers," said Mark Vipond, president of ACI Worldwide. "With our solutions, companies can cut costs associated with paper and postage, improve marketing communication by embedding links and messages within electronic documents, and accelerate customer adoption by delivering real documents via e-mail--the format consumers overwhelmingly say they prefer."

e-Statement Courier and e-Billing Courier are two of the products in ACI's e-series portfolio of secure electronic commerce software and services. ACI's e-series solutions are designed to integrate with existing payment systems and allow consumers to transact business in new ways.

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 530 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. Factors that could cause actual results to differ include but are not limited to the following.

The success of TSA, or any of its subsidiaries, entering into a new distribution or partnering arrangement depends on numerous factors including the acceptance of the distributed products or services by TSA's existing customer base and integration of the products and services into TSA's marketing efforts, the quality of the products or services as perceived after use by TSA's customers, and the degree of competition from competitive products or service providers.

TSA's business is concentrated in the banking industry, making it susceptible to a downturn in that industry.

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.