Ok, I finally got it working...
Things I noticed that I had to change...
In the readme, it says
Code:
**NOTE** When adding your Ebay Sniplet Source Code to the template, find this bit &si=whatever and add your profile field: &si=$vbulletin->userinfo[fieldx]
To get it to work, I would have needed it to read like this:
Code:
**NOTE** When adding your Ebay Sniplet Source Code to the template, find this bit &siteid=whatever and add your profile field after: &si=$userinfo[fieldx]
I had to remove the " vbulletin-> " part