When you buy postage on ebay the you buy it through packlink which is a middleman.
See the link
https://support-ebay.packlink.com/hc/en-gb/categories/360002570200-How-to-use-Packlink-
Personally I would not use it. Much better to be in control of your own postage
Ifn you do then you need to check the prohibited items as there is a long list ( as there is on many other couriers)
