S1 Corporation (S1) is a global provider of customer interaction software solutions for financial and payment services. It sells its products primarily to traditional financial services providers, such as banks, credit unions, and insurance companies, as well as to transaction processors and retailers. The Company has two business segments: Enterprise and Postilion. The Enterprise segment is engaged in providing software solutions and related services that the financial institutions use to interact with their customers, including self service banking solutions, full service banking solutions. The Postilion segment represents payments processing, card management solutions, and banking solutions.