We used to refund for orders through "Invoice" then "Credit Memo" all the time on Magento. However, the option stopped working and whenever we try to refund, it shows that there has been an error and the refund cannot be processed.
We use Authorize.net as our payment and we haven't changed anything on Magento nor Authorize.net that could've caused this problem.
I'm currently refunding through Authorize.net manually but since it does not leave anything on Magento that the refund has taken place, it's causing all sorts of data problem.
Did anyone go through the same problem and was able to find out the solution?