Webhooks v3 provides access to all the events that have been made accessible to customers, at this point in time, that means the entityCreated, entityDeleted, and entityUpdated events. The Identity Cloud maintains an allow list of the events that customers can subscribe to by using Webhooks v3; that list that can be updated at any time by making a single API call (although currently only Akamai support personnel can make that call). For example, suppose the Identity Cloud generates event types A, B, C, D, and E; however, only events B and D are on the allow list. Which event types can you access by using Webhooks v3? You got it: events B and D. If a new event type (type F) is created and is added to the allow list then you’ll be able to access events B, D, and F.
As of this writing, there’s no simple way to determine which events are on the allow list. For the time being, we'll have to let you know when changes are made to the list.