Postilion Solutions for financial institutions receive Visa Payment Application security validation

Atlanta, Georgia, USA and London, UK, 07 Aug 2007

Postilion, a leading global provider of integrated solutions for self-service banking and payment processing, and a division of S1 Corporation (NASDAQ: SONE), today announced Visa Payment Application Best Practices (PABP) validation of Postilion applications used by banks and credit unions.

This validation - by Visa USA and Visa Europe - indicates that the Postilion solutions for ATM Driving and Merchant Acquiring handle cardholder data in a secure manner. It follows the July 2006 validation of Postilion applications for retailers, when Postilion was the first payment switch to achieve PABP validation in Europe.

Visa PABP defines application best practices that are considered to be the industry standard for the data security of payment applications. Visa designed this program to assist software vendors in developing secure payment applications that minimise security breaches and compromised card details.

Using these secure Postilion solutions will help banks and credit unions comply with payment industry standards such as the Payment Card Industry Data Security Standard (PCI DSS). Visa Europe and Visa USA list applications that have received this validation on their Web sites.

Dean Jordaan, Postilion's Senior Vice-President of Global Product Strategy, says: "We are very pleased to have received Visa PABP validation of our solutions for financial institutions in addition to those for retailers. This validation confirms our ongoing commitment to ensuring the secrecy and integrity of cardholder data."

Postilion was guided through the Visa validation process by AmbironTrustWave, an independent, Visa-qualified security assessor. "The continued participation of Postilion in this crucial programme shows the company's proactive approach to developing software solutions that safeguard consumer data. In addition, this most recent validation indicates to financial institutions that using Postilion solutions can help streamline their PCI DSS compliance," says Brooks Wallace, Managing Director of AmbironTrustWave.

Postilion

Postilion, a division of S1 Corporation (NASDAQ: SONE), is a leading provider of integrated solutions for self-service banking and payment processing. Our offices, on five continents, serve customers in more than 50 countries. The Postilion product drives self-service financial transactions and payments, including advanced transactions such as prepay, through Internet access points, ATMs, POS terminals, and phones. This multi-channel architecture - built on open systems - provides consolidated management information, card management, 3DES and EMV enablement, and loyalty software solutions. At the forefront of compliance with new regulations and security enhancements, such as application validation for Visa's Cardholder Information Security Program Payment Application Best Practices (CISP PABP), Postilion can help customers achieve compliance with the latest data security standards developed by the payment card industry (PCI DSS). More information is available at www.postilion.com.

S1 Corporation

S1 Corporation delivers customer interaction software for financial and payment services and offers unique solution sets for financial institutions, retailers, and processors. S1 employs 1 400 people in operations throughout North America, Europe and Middle East, Africa, and the Asia-Pacific regions. Worldwide, more than 3 000 customers use S1 software solutions, which comprise applications that address virtually every market segment and delivery channel. S1 partners with best-in-class organisations to provide flexible and extensible software solutions for its customers. Additional information about S1 solutions is available at www.postilion.com, www.S1enterprise.com, and www.fsb-solutions.com.

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Postilion Solutions for financial institutions receive Visa Payment Application security validation

Postilion's ongoing commitment to securing payments recognised.