Fiserv (FI) 8-K Fiserv Completes Combination With First Data Further Cementing Industry Leadership

Exhibit 23.3

Consent of Independent Registered Public Accounting Firm

The Executive Sponsors

Wells Fargo Merchant Services, LLC:

We consent to the incorporation by reference in the Form8-K of Fiserv, Inc. dated July 29, 2019 and the Registration Statement Nos.333-145599,333-143191,333-163636,333-188795 and333-231868 on FormS-8,No. 333-229689 on FormS-4, andNo. 333-227436 on FormS-3 of Fiserv, Inc. of our report dated February 15, 2019, with respect to the balance sheets of Wells Fargo Merchant Services, LLC as of December 31, 2018 and 2017, the related statements of revenues and expenses, members’ equity, and cash flows for each of the years in the three-year period ended December 31, 2018, and the related notes, which report appears in the Form8-K of Fiserv, Inc. dated July 29, 2019.

/s/ KPMG LLP

San Francisco, California

July 25, 2019