CONSENT OF INDEPENDENT AUDITORS We consent to the reference to our firm under the caption "Experts" in Amendment No. 1 to the Registration Statement (Form S-3) and related Prospectus of Billserv, Inc. for the registration of 4,146,154 shares of its common stock and to the incorporation by reference therein of our report dated February 5, 2002, except for Note 18, as to which the date is November 14, 2002, with respect to the consolidated financial statements of Billserv, Inc. included in its Annual Report (Form 10-K/A) for the year ended December 31, 2001, filed with the Securities and Exchange Commission. /s/ Ernst & Young LLP ---------------------------------------- Ernst & Young LLP San Antonio, Texas November 14, 2002 19