I cancelled it for you.
The transaction is only $5, so the fee to process it is more than the item value.
Secondly it's for code. There's no way for our MM to check or secure this code. It can be used or fake, so a MM does not add any extra security.
The fee will be refunded within 24 hrs, but normally much sooner. You can conduct the transaction directly with the buyer or seller. Sorry.