EXHIBIT 15 May 5, 1999 The Stockholders and Board of Directors First Data Corporation We are aware of the incorporation by reference in the Registration Statements (Forms S-8 No. 33-47234, No. 33-48578, No. 33-82826, No. 33-87338, No. 33-90992, No. 33-62921, No. 33-98724, No. 33-99882, No. 333-9017, No. 333-9031, No. 333- 28857 and No. 333-68689, Forms S-3 No. 333-4012 and 333-24667, and Form S-4 No. 333-15497) of First Data Corporation of our report dated April 23, 1999 relating to the unaudited consolidated interim financial statements of First Data Corporation which are included in its Form 10-Q for the quarter ended March 31, 1999. Pursuant to Rule 436(c) of the Securities Act of 1933 our reports are not a part of the registration statements prepared or certified by accountants within the meaning of Section 7 or 11 of the Securities Act of 1933. Ernst & Young LLP Atlanta, Georgia