You had an item listed at $XX
A customer haggled.
He haggled a lot if his three offers were used up and you had to move to Messages.
He asked you to relist with the (finally!) agreed price.
Before you could do that*, he purchased and paid the listing price.
You shipped.
He recieved.
Now he wants a Partial Refund.
If it's good enough to keep, it's good enough to pay for.
I'd stand firm.
He wanted it enough to pay full asking price.
He reports no problems with the doohickey.
The only problem I foresee is that he might leave you negative feedback, which would poison your selling account since you have so little FB.
But as an occasional seller, no worries.
You can have multiple accounts, although each must have its own email address and credit card verification.
Also I notice you are selling game cards, so ..... well ..... gamergate made many people notice how.... difficult some gamers can be.
I'd be inclined to very politely tell him (deep breath) that the transaction is complete and that he purchased at the list price so any other negotiations are moot.
Just to be clear-- one card or a number of them?
*Your second customer is irrelevant, so let's ignore him.
