How to configure a plugin (vmshopper) inside virtuemart?

[reinhold]

I'm currently developing a vmshopper plugin (which allows customizing order numbers, invoice numbers and order passwords), which needs some configuration. Ideally, I'd like to do this inside virtuemart, but I couldn't find any place where a vmshopper plugin could offer a GUI for customization.

My current solution is to use the Joomla plugin parameters, where the user can configure the VirtueMart plugin in the extensions menu of the Joomla backend. However, to do sanity testing of the settings, I need to be able to execute some code and ideally have access to the virtuemart data structures.

Any idea how I can provide a nice configuration GUI in the Virtuemart backend for my vmshopper plugin?

Thanks,
Reinhold