ebay number

[nkwazi21]

I have noticed that on the last 3 items I have sold there is a reference number underneath 1st line of customers address, for example ebay c4rc55y.What is this number for as never had it on any other items in the past.

[61stephenuk]

All explained here

https://community.ebay.co.uk/t5/Announcements/Royal-Mail-tracking-and-delivery-events-on-eBay-from-1...