You probably had to give ebay a CC number so that they can automatically bill you for ebay fees when you sell something. The best way to find out for sure is to go to ebay and see if there is anything in your "my ebay" under items won. If not, then it was either a scam trying to get info, or it was a mistaken e-mail. Also, did the e-mail give you a link to click on to submit info? If so, then it's a scam. Look at where the "link" says it's from, then look at the actually properties of the link. I'm constantly getting crap from "Pay Pal" that says I have "added [email protected]
to my paypal account." If I "did not authorize this e-mail address, please go to (a link that appears to be from paypal.com) and update my information. The link actually says, "paypal.com", but by checking the properties, I can see that the link is actually taking me somewhere else. If you click on the link, it even LOOKS like the paypal site, but it's not. So be careful. If you ever get a link asking you to go to ebay, paypal, or even some CC company and enter information, NEVER use the link sent in the e-mail. Go directly to the site through your browser and check on your account that way. 99.99% of the time, you'll notice that nothing is different with your account.