As independent  public  accountants,  we hereby consent to the  incorporation by
reference in this registration  statement of our reports dated October 28, 1999,
included in Transaction  Systems  Architects,  Inc.'s Annual Report on Form 10-K
for the fiscal year ended  September 30, 1999, and to all references to our Firm
included in this registration statement.


Omaha, Nebraska,
November 8, 2000