Thanks, good to hear that this helped.
Normally I don’t recommend that users edit the code, because any changes are overwritten by subsequent updates to the plugin.
But this is a special case, as the fiat coin adapter will be merged to the parent plugin, as a fiat wallet adapter.
You can rely on the fact that the WordPress text filters will be preserved.
However, the JavaScript validation code will have to be different. Ask me again about this when the time comes to upgrade. It will be very easy to override frontend JS code in the next major version, using the new templates format.