Login to page URL: https://ss.shipstation.com/
In Dashboard page click on Settings-> click on Account-> click on API settings
Click on generate API keys
Copy the API Key and API secret key:
Select ship station and click on Direct Label printing:
Insert the Above copied API keys in Manage Ship Station Shipping Settings:
Click on Save and then Click on “Test Connection”. You get the message as “Successfully Connected” when your integration is successful.