File: In this photo illustration, a Zelle logo is displayed on the screen of a smartphone. (Photo Illustration by Sheldon Cooper/SOPA Images/LightRocket via Getty Images) Users on Down Detector ...

New York (CNN) — Zelle is returning to service after an outage for customers at some banks due to what the popular peer-to-peer payment platform blamed on a problem at a different firm. DownDetector, ...