Our SquareSpace website offers "Carrier Calculated" shipping however the UPS Ground rates are often much more than what we will actually pay with Shipstation UPS rates. Overcharging my customer for shipping is not a good move they may elect not to purchase at all.
I recently contacted both Sqaurespace and Shipstation chat help to find out more and here is what I learned:
FROM SHIPSTATION CHAT REP
"Unfortunately, this is because at this time square space does not have an integration with us to display live rates. Because we do have what is called checkout rates that pull and display the ShipStation rates as the user checks out this is only avalible with Shopify, Bigcommerce, Magento and Wix though."
This is a request for shipstation to reach out to square space and add this "checkout rates" integration