I've read through a few previous posts but I am still unsure on how to go about this.
 
Customer invoice was for $82.01.  We received and processed a credit card payment for $82.01, account balance being zero.  Customer returns item, we issue a credit memo for the original amount less restocking fee. We refund his credit card but the customer now has a credit memo on their account for -$59.00.
 
We started to use AR-M but was unsure how to continue when it asks about manual check or A/P voucher?
 
Any help would be great.  Thanks
 
Brian