Yes, you will need to refund them. Send a cancellation which will
trigger an automatic refund to the buyer and you will get your eBay
final value fee credited back.
It's all too easy to activate the 'one touch facility' - i've done it
myself more than once - but you can change it back by logging into your
PayPal account and following the instructions on there.
You would need to adjust the invoice before the buyer pays or eBay will
and do take their fee based on what it says the item sold for incl the
postage on the original listing. You might actually be better to fold up
the item and package it before lis...
Is that your listing? it seems that's for a brooch sold by an US seller
so wondering why it's important to you. Price that the auction ends at
is the price the buyer pays, you cannot change it.