Wonder Lister
User guide

Getting an error related to security token. What should I do?

Wonder Lister communicates to eBay on your behalf. When you first add your eBay account in Wonder Lister, eBay gives Wonder Lister a unique token. This token is used by Wonder Lister to talk to eBay. eBay decodes this token to get to know which eBay account it belongs to. eBay issues that token for a limited period of time after which it expires. eBay does this as a security precaution. Once a token has expired, Wonder Lister won't be able to talk to eBay for the associated eBay account.
To handle this error, you need to authenticate again the associated eBay account. Please see Reauthorizing an account