Upload the Ebay User Token plugin to your blog
Activate it and enter keys for application. You can get it on ebay developer site.
Insert to any page short tag [ebay-user-token]
Configure ebay developer tools
- Get Application ID, Developer ID and Certification.
- Generate RuName and set for it success and fail backlink redirect url
success: https://mysite.tld/?p=num&ebay-user-token=success
fail: https://mysite.tld/?p=num&ebay-user-token=failed
Where num - is post id where you insert short tag [ebay-user-token]
Details about ebay developer tools:
http://developer.ebay.com/DevZone/guides/ebayfeatures/Basics/Tokens-MultipleUsers.html#OptionWebServerApplications