BillMatrix (now called Fiserv) is a global leader in electronic payment services. The company specializes in offering the innovative and reliable payment processing and billing services. It was established in 1994. But in 2005, it was acquired by Fiserv and renamed as Fiserv in 2009. Fiserv has been listed among the Fortune 500 companies. Furthermore, the company was at number one position according to the FinTech 100 Survey. The head office of the company is situated in Brookfield, Wisconsin. There are about 20,000 employees working in the company. It has presence at 250 locations across the globe. The company in June 2010 acquired the financial software developing company AdviceAmerica. The postal and official address, email address and phone number (helpline) of billmatrix service center is given below. The helpline of billmatrix service center may or may not be toll free.