That's exactly what I've got going on with a default handler to attempt to process CCs from locally stored numbers....Modules can simply implement their own hook so store owners can choose to use that module for processing the fees.

Hi Ryan,

This sounds great. I just posted the Authorize.net CIM module in contributions (
http://www.ubercart.org/contrib/2537). If a store owner is using that module, instead of processing the fees with a locally stored number they would use the numbers stored on the Authorize.net servers. Once you have that hook defined, let me know and I will integrate it into the Authorize.net CIM module.

Thanks,
Chad