click the Reports Button (in the upper right hand corner)
click the Daily Activity link
When the Daily Activity link Report loads, Search by the day and click run report
Find the Delayed Capture of the transaction you want to credit (this will not work Authorizations. Authorizations are the capture of funds)
Open the Delayed capture (you can confirm that the Purchase Order Number matches that of SW21’s Invoice#)
Highlight & Copy the Transaction ID (at the top of screen)
Next click on the Virtual Terminal at the top of the screen
Click the Single Transaction link
Leave Tender Type of Credit Card as is
change the Transaction Type to CREDIT
Now the Original Transaction ID will appear, paste in the ID you just copied
On the Transaction information screen, you can change the amount to anything up to the full amount of the original charge.
As long as Result Code: 0 and Response Message: Approved appear at the top of the screen, this is how you know a transaction was successfully credited.