Does Certain integrate with on24?

Yes, Certain integrates with ON24 through Certain Signal Connector and its ON24 sub-module. The setup uses ON24 API credentials plus Signal Connector flows for registration, attendance, and engagement sync.

You need ON24 access to all endpoints, an API access token, and a Signal Connector connection configured with the Client ID, Token Key, and Token Secret. See Digital Events: Using Certain Signal Connector with ON24 and Preparing ON24 for Signal Connector Integration.