S1 an ACI Worldwide company

S1, now an ACI Worldwide company, provides secure, multichannel, mission critical payment solutions for leading retailers worldwide. We are proud to count 14 of the top 35 global retailers, 6 of the top 10 UK retailers, and 11 of the top 15 US retailers, as customers. ACI offers stability, reliability, scalability and agility. We are focussed, global, an expert and a leader. Over 35 years, we've built an unrivaled understanding of payment processes and how to improve them.

Stratus Technologies is a long standing Server platform partner. Also we are a key Microsoft Global ISV.

EFT/Payment Solutions | Gift Card Solutions | Multi-Channel Solutions