If you are considering upgrading your Magento to the latest version - 2.3.1 - note that ShipStation is not compatible with this version. While SS will receive orders from Magento 2.3.1, SS will not send data back to Magento and you will have to manually execute the "invoice" and "shipment" for each order to capture funds. Speaking with a SS rep yesterday, they said an upgrade is being worked on, but no release date has been announced yet. So while SS can still print labels and inform your customers, it can not inform your Magento 2.3.1 market place.
If anyone have more information or a work around, please let me know.
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