It is the set up of a fraud third party payment or escrow service that the scam pivots on ie the scammers clone the square trade escrow site or another so that they have immediate access to the car payment and shipping fees, while the seller believes their p[ayment is secure. Generally the ebay account that the car has been listed on has also beeen stolen.

This often shows in the feedback or the sold items search of the stolen account. Often the accounts have a period of inactivity.

If you believe that the ebay account has also been stolen you should report username and listing