We're a Certified re-seller for some air-quality monitoring products by Airthings. We have a few of their products in our store, but they charge a flat $45 Courier-Shipping fee per order, and ship directly to the customer. The customer could in theory buy multiple Airthings products and when we place the order it would still be a $45 flat courier cost. Is there a way we can put a Shipping Cost on a per-product or Per-Product-Category level? Then within the cart it would be a section for any of the specific category of item (if it appears in the cart) with an automatic fee associated?