It is very tedious to manage and update Default Shipping Service, as this is not currently exportable or updatable in bulk, but only by opening a single Product, going to the Shipping tab, and setting the default shipping service. Shipping via the wrong service gets very expensive, so we need a good way to export, audit, and update in bulk. This data is clearly stored associated with the product, but when I've requested it even as a one-time pull, I was told that ShipStation could not provide that.
Product Shipping Default Shipping Service Bulk Export and Update
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