To cancel a transaction, both you and the buyer need to agree on the cancellation or you won't receive a final value fee credit.
To cancel a transaction, open a case in the Resolution Centre.
A few important notes:
The buyer has up to 7 days to respond to your case. To receive a final value fee credit, the buyer must agree to cancel the transaction. If you haven't received a response after 7 days, close the case and you'll receive a final value fee credit.
You need to close your case within 60 days after the sale. After 60 days, if you haven't closed your case, eBay automatically closes it and you won't receive a final value fee credit.
After you've closed your case you'll receive a final value fee credit within 7 to 10 business days.
Learn more about cancelling a transaction.