Listing data needed for webhook notifications
id: number
name: string
slug: string
webhook_url: string
max_attendees: number
attendee_count: number
unit_price: number
can_pay_more: boolean
customisable_days: boolean
duration_days: number
Maximum day count for a customisable listing — the bound the shared price evaluation validates a booked span against.
months_per_unit: number