You have the option to refund a document that was settled using iPayment.
The option can be found as a right-click menu item.
The system will void/refund the entire settlement and will cancel any incoming payment that has been created by iPayment.
After the refund is done it will ask if you want to create a credit note.
If you press this option it will open the A/R Credit Memo window which can then be added to the system.
Note: For A/R Down Payments you need to refund any invoice document before you can refund the A/R Down Payment.