EXHIBIT 99.4

                                  FISERV, INC.

                                OFFER TO EXCHANGE
                          REGISTERED 3% NOTES DUE 2008
           FOR ANY AND ALL OUTSTANDING UNREGISTERED 3% NOTES DUE 2008

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           THE EXCHANGE OFFER WILL EXPIRE AT 11:59 P.M., NEW YORK CITY
             TIME, ON ________, 2003, UNLESS THE OFFER IS EXTENDED.
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To Our Clients:

        Enclosed for your consideration is a Prospectus, dated _________, 2003
(the "Prospectus"), and the related Letter of Transmittal (the "Letter of
Transmittal"), relating to the offer (the "Exchange Offer") of Fiserv, Inc. (the
"Company") to exchange its 3% Notes due 2008 (the "New Notes") which have been
registered under the Securities Act of 1933, as amended, for all of its
outstanding unregistered 3% Notes due 2008 (the "Old Notes"), upon the terms and
subject to the conditions described in the Prospectus and the Letter of
Transmittal. The Exchange Offer is being made in order to satisfy certain
obligations of the Company contained in the Registration Rights Agreement, dated
June 27, 2003, by and between the Company and the initial purchasers named
therein, related to the 3% Notes due 2008.

        This material is being forwarded to you as the beneficial owner of the
Old Notes held by us for your account but not registered in your name. A tender
of such Old Notes may only be made by us as the holder of record and pursuant to
your instructions.

        Accordingly, we request instructions as to whether you wish us to tender
on your behalf the Old Notes held by us for your account, pursuant to the terms
and conditions set forth in the enclosed Prospectus and Letter of Transmittal.
We urge you to read the Prospectus carefully before instructing us as to whether
or not to tender your Old Notes.

        Your instructions should be forwarded to us as promptly as possible in
order to permit us to tender the Old Notes on your behalf in accordance with the
provisions of the Exchange Offer. The Exchange Offer will expire at 11:59 p.m.,
New York City time, on _____________, 2003, unless extended by the Company. Any
Old Notes tendered pursuant to the Exchange Offer may be withdrawn at any time
before the Expiration Date.

        If you wish to have us tender your Old Notes, please instruct us by
completing, executing and returning to us the instruction form enclosed with
this letter. The Letter of Transmittal is furnished to you for information only
and may not be used directly by you to tender Old Notes.

        If we do not receive written instructions in accordance with the
procedures presented in the Prospectus and the Letter of Transmittal we will not
tender any of the outstanding Old Notes on your account.