Is it fair to return payment after your client disapproved of your output as a freelancer?

[Btaliat]

I understand what you meant. However, there are two ways to this. If you have met up with the criteria but the customers are not happy, you are to decide to return the money or not but you are not obligated to do so. But if you don't like having unhappy clients, you can decide to refund. On the other hand, id you are the one not fulfilling your part, you should do the refunding to the clients.