are you sure SMFShop is secure enough for real money?
SMFShop itself is quite secure, the items slightly less so (but I'm recoding a lot of the items for a future release, anyways)
Maybe SMF should also be modded to keep a transaction log of all purchases (if it doesn't already) so that you can verify if the user spent the credit he purchased or not as another security measure.
Again, something I was planning, but never completed.
probably wont get time to work on this till next week
I don't get much time to work on SMFShop, either (due to school)...I haven't really touch the code much since January, other things (school especially) have taken all of my spare time.