How do I authenticate subscribers? Craig Conover February 16, 2021 06:24 Updated Use PubNub Access Manager for Access Control. Below is a diagram which shows basic key exchange. Related articles How do I create device interaction on a geo grid? How do I synchronize multiple devices? Where do I get started learning PubNub? How do I add notifications to a chat room app? Can I build threaded messaging app using PubNub?