During the setup process, you will need the cell phone associated with the account, if eBay chooses to verify that you are the account holder. See also eBay Technical Reference.
To setup eBay in Descartes ShipRush Web:
Click SETTINGS, and then click Add Web Store (top of screen). The Web Store Configuration dialog is displayed.
Click the ebay icon. The eBay Web Store Information dialog is displayed.
Enter your eBay Web Store Name and eBay Username. Click Next.
Accept the Terms and Conditions to allow the reading of data from your eBay account.
Continue following the setup wizard until complete.