Returns the un-flattened provider-to-operatory schedule for a provider, preserving which provider is assigned to which operatory, the blocks that remove availability (such as lunches, meetings, vacations, and holidays), and the appointment-type restrictions that apply to each window. This complements Load Schedule, which merges availability into a single open-hours track per resource and therefore cannot express which provider is assigned to a given operatory — the information needed by multi-column practices where providers float between operatories. The request is rooted at a provider; use the sentinel resource "resources/provider_-" to load every active provider (the full appointment-book grid). You can obtain valid resource IDs from the List Resources endpoint.