How do I downgrade my keys from a paid plan to a free plan?
Log in to your PubNub Dashboard account, select the App and Key that you want to downgrade, then select the Upgrade button at the bottom of the left nav bar.
Click the Cancel Plan link under the Free Account panel. This will send a request PubNub Support to discontinue billing for this key. It may take up to 5 days for this action to be completed (typically sooner).