Not necessarily related, but I just posted a thread to the Tradeking API forum with a perl OAuth POST implementation specifically for TradeKing. I don't have much experience with Net::OAuth, but LWP::Authen::OAuth seems to be much more straightforward for this purpose. Cheers

The post is at:
http://community.tradeking.com/groups/tradeking-api/forum/topics/11144-tki_overide-missspelled-in-documentation-to-tki_override/forum_posts