event_listener is an optional entry that can be used to specify a URL and credentials for accessing the SSE Proxy. It is not required since CUE Zipline is capable of discovering the SSE Proxy itself, and if no other login credentials are specified, it will use the Content Store login credentials specified under the endpoints entry. You can, however, user the event_listener entry to override the discovery process, or specify alternative credentials:

        url: sse-proxy-endpoint-url
        user: content-store-user
        passwd: content-store-password