To synchronize your eBay account with WebInterpret, eBay uses what is called a "token", a crypted link that enables communication between your eBay and WebInterpret accounts without having to provide us with any sensitive data like your account password.
Please note that certain changes to your eBay account, such as your password, will automatically revoke all active tokens. This means we will be unable to access your account, synchronize your items and manage your stocks of your active foreign listings.
For more information, check out our guide here: Tokens And How To Keep Connected
We also recommend reading our FAQ on tokens.