19-12-2020 10:00 PM
Clearly to protect yourself you need to read up on how auctions/eBay works.
One of your comments says -
“I had been outbid once in July,then highest bidder didn't pay. Seller asked me to pay highest bid through PayPal as there can be case opened. I paid as I didn't know it then. But I clearly didn't have to pay more than I bid.”
If a winning bidder does not pay there no obligation on any other bidder to pay.
A seller can offer a second chance to an under [losing] bidder at their highest bid, but they don't have to pay and no one can force them to pay.