Simplify billing and payment with ACI Worldwide. ACI Worldwide is a billing and payment systems expert, processing $14 trillion per day for 5,100 clients around the globe. With ACI you get a single system to centralize billing and payment across your entire organization. Save staff time with ACI’s pre-integration into 100 partners that serve governments. Visit www.aciworldwide.com/government or contact us at firstname.lastname@example.org or 402-390-7600.