This documentation was deprecated 08/01/17. Information here may be incomplete or out of date.
After creating your Shop in Whiplash, there’s a connection to Whiplash that has to be set up on the eJunkie side as well: http://www.e-junkie.com/ej/help.integration.htm
Here's the important part: "To have order data sent to the same URL for all purchases, you can specify your URL in Seller Admin -> Account Preferences as the Common Notification URL.”
The Common Notification URL should be set to: https://www.whiplashmerch.com/platform/ejunkie/order