Returns one supplier product with its options, units of measure and variants, plus supplier prices for the branch in price_fetch_preferred_vendor. Without that parameter Zuper prices at the provider's default branch; if none is set, it picks your oldest saved branch and saves it as the default. Each variant's vendor_cost has one entry per unit of measure: availability comes from the branch stocking data Zuper syncs from each supplier, and a variant the branch does not stock is not sent to the supplier: its entry has cost 0, is_available false and the message "Not stocked at this branch". QXO can also return an available option with cost 0 and status "Call for availability" when the branch stocks it but QXO gave no price. Rely on is_available rather than the supplier-specific status text. Zuper may reuse a supplier price answer for up to 15 minutes, so a price can be that old. If the supplier returns no price lines for the product at that branch, or cannot be reached, the product is still returned but its variants have no vendor_cost; if it prices some options and not others, each unpriced one gets an entry with cost 0 and a message such as "QXO did not quote a price for this option in EA". Returns 403 when the product is not stocked at any of your connected branches and 404 when it is unknown or inactive. Requires supplier integration to be enabled for the company; otherwise the request fails with 400.