Retrieves a list of all price books
When set to 'true', only returns price books that are currently effective based on their effective date range.
true Successfully retrieved price books
ISO date string (e.g. "2025-01-01"). Requires PRICE_BOOK_EFFECTIVE_DATES feature.
ISO date string (e.g. "2025-12-31"). Requires PRICE_BOOK_EFFECTIVE_DATES feature.