Creates a new webhook at the account level. Account-level webhooks fire for the specified trigger across all events in the account. The webhook URL must be a valid HTTP(S) URL and must be unique per trigger within the same account.

Optionally, for attendee_created and attendee_updated triggers, you can pass administrative_area_ids to restrict the webhook to only fire when the attendee's event belongs to one of the specified administrative areas. The IDs must reference non-archived administrative areas in the same account.