21-11-2020 12:02 PM
Its ebay's VTN,virtual (postal) tracking numbers for sellers mainly and can help in avoiding claims of none receipt,while making sellers exempt from late delivery defects.
Its none compulsory,so you can post out without the digits as normal
It is in the announcements somewhere
Ebay add if for when a seller buys ebay postage.
It is when you buy ebay postage
If you dont do that then just delete it