how do i make a partial refund for overpaid postage ?

[sp15x]

A customer in Canada has bought an item for which the ebay postage calculator estimated a $ 13.70 postage charge. however the item only cost us $2.35 for a letter to Canada. We would like to refund some of the postage back to the customer. How do we do it?

[licr-9909]

careful ebay doesnt give partial refund for fees youve paid - $13.70 x 11% is $1.40

[twyngwyn]

this thread is from 2012??

[sandypebbles]

Things were very very different nine years ago when this was asked and answered, licr-9909