Once done, here's how to reverse a credit card transaction:
From the menu bar on any page, choose Processing Tools .
Go to Reverse a transaction.
Enter whatever information you have to find the transactions you want to reverse.
Select the transaction(s) you want to reverse from the list and then click Submit.
I also encourage you to contact our Merchant Service Support Team so they can un-link the invoice payment that has been paid through credit card. This way, your customer still be able to pay the invoice using the ACH.