This is the Enerflo {event_name}. Full list of events can be found here: https://docs.enerflo.io/docs/enerflo-v1-event-definitions

This is the full URL of the destination that will receive the POST payload the webhook will deliver. (Ex: "https://yourtarget.com/path")

The only distinction between "v2" and "v3" webhooks is the content of the response. There is no difference in the triggering logic. Most partners use the "v2" webhook version as they tend to have more data.