If you have high volume sales, refunds are occasionally happening. There will be always unhappy customers which can’t get software working and can’t give you steps to reproduce the problem(s). Even, if you give them answer how to solve the issue, they may still want their money back.
I have had approx. 4–5 refunds per 1000 sales. The problem is that eCommerce (for example Plimus) are charging you for additional fee per refund ($15 for Plimus). So, if customer wants to get his money back, you lose 1 sale + $15. Not a big deal, but who wants to pay additional money for nothing.
How can we save this money? Just ask unhappy customer if the have PayPal account and if he does, send him money back from your PayPal or credit card. In such case, unhappy customer will have his money back and ecommerce will not charge you additional fee.
Little math:
Per 5 refunds = 15 * 5 = you save $75
Hope this will help you.