For the most part this is no different than what you were used to doing before.  You will make an account adjustment to the member’s credit card loan, giving them credit for the item in dispute so no finance charges are accumulated on that balance.  The amount is moved your designated G/L where the balances for these items are held. 

Upon either receiving credit from the credit card vendor or denial of dispute, you either apply the credit to said G/L or reapply the charges back to the member’s credit card loan account.