To manage each individual transaction, first go to the Reports section of the main menu, then click on the “Details” button next to the transaction information. (You can also get to a similar view of options by going to the Activity section in the Campaign Editor for a specific campaign.)
Within here, you can use the different buttons shown to Download the Receipt and Resend the Receipt, as well as Issue a Refund, Add a Note to the transaction, or Send a Message to the supporter -