Thank you for this comment.
Keep in mind that you can always hop to phpmyadmin and remove any transaction.
Also, in the near future I will add the ability to withdraw fiat.
The fiat coin adapter is there only to facilitate exchange markets with fiat-crypto. I do not want it to evolve into a full fiat money management system. This would be out of scope of this plugin.
Perhaps an admin should be able to cancel transactions even if they are in a “done” state. This would solve the problem you mention. I will look into this.
with regards