Standard Bill Runs:
Use GET /bill-runs to retrieve information about billing cycles.
Ad-hoc Billing:
Use POST /adhoc-bill-runs to create ad-hoc bills for specific products or customers.
Use PATCH /adhoc-bill-runs to automate ad-hoc bill run processes.
Use GET /adhoc-bill-runs to retrieve ad-hoc bill run details, including adhocProductInventoryIds and rentalProductInventoryIds that were billed.