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    Fiserv Corporate Headquarters

    255 Fiserv Drive
    Brookfield, WI 53045
    PO Box 979
    Brookfield, WI 53008-0979

    Customer Service:

    BillMatrix:
    1-800-967-9649

    Card Services:
    800-554-8969

    MyCheckFree®:
    800-564-9184

    On Demand Payments:
    866-661-8547

    Walk-In Solutions:
    800-676-6148

    Sales Representative:

    262-879-5000

    Toll Free: 800-872-7882