on 01-23-2020 03:06 PM
How can I prevent someone from bidding on my auctions
https://pages.ebay.com/services/buyandsell/biddermanagement.html
To cancel a bidder's bid:
https://offer.ebay.com/ws/eBayISAPI.dll?CancelBidShow
Blocked bidder/buyer link:
http://offer.ebay.com/ws/eBayISAPI.dll?bidderblocklogin