Return the per-channel pricing ratio of each OTA listing linked to a property (property_id) or a room type (room_type_id). Pricing ratio is the percentage Hostex multiplies a base (property/room-type level) price by to derive the actual price pushed to each listing. Use this endpoint at the skill layer to compose a 'change price by property / room type' workflow: read the ratios, compute target_price = round(base_price * ratio / 100) for every non-readonly listing, then call POST /listings/prices once per listing. Listings marked readonly: true are silently controlled by the channel (e.g. Airbnb child rate plans) and cannot be repriced via POST /listings/prices; skip them.