OK I understand now.
Since you are using a custom token with the fiat coin adapter, you should know that I already am planning to implement manual withdrawals to that particular adapter. I simply haven’t got around to do this yet because I am very busy with other components. I am currently working on improvements to the Exchange extension. I will add withdrawals when I get to the next sprint for the Fiat coin adapter.
For overriding the icons, please see the manual under Frontend -> JSON API filters -> Coin icon for an example. You should add the code either to a child theme in your functions.php file, or as a new plugin.
In the future could you please start a new thread if you have a new request? This helps me and others who read the forum later.
with regards