ShipStation

From Magento root folder :

Create app\code\Auctane\Api folder
Extract the zip file into app\code\Auctane\Api
Execute command php -f bin/magento setup:upgrade

Authentication

Generate an API key in Stores -> Configuration -> Shipstation -> Generate and save api key.
- If you need to setup ShipStation for multiple stores, a key needs to be generated for each stores by changing the Magento store scope.
In ShipStation, specify the api key for each store you want to manage.