The processing is somewhat difficult to come by, at least it used to be, you should hit the guys at CCBill up and talk to them about their new processing solution for physical goods, its actually a pretty sweet setup they have

We used to run several online stores in both adult and mainstream and mail order was always a royal pain in the ass because of issues with shipping, that being said, as long as you can 100% PROVE the goods were shipped and delivered, you shouldnt really have any problems.

Regards,

Lee