Click on "**Reports**" tab to look up credit card transactions, then "**Keyword search**" field to find credit card transaction to needing refunded.
All transactions with the keyword searched will be listed, as reflected on image below (one transaction listed).
**Tip**: most commonly search by entering invoice number, account number,\
name of the card, or last four-digits of the card number.
This example used is for invoice# 522179