RentalCreate a rentalCreate a rental POST /v2/rentals Supports both single-item (legacy) and multi-item formats: Single: { item_id: 1, quantity: 2, renter_id: 5 } Multi: { items: [{ item_id: 1, quantity: 2 }], renter_id: 5 } Request Responses201401422RentalResourceUnauthenticatedValidation error