No, payment profiles are global, otherwise the shopping cart feature wouldn't work. The exception being the Classifieds section, which checks to make sure all cart items come from the same Business Profile.
"Trade post" is posting a message to a trade, it is not "posting a new trade". There is currently no API for creating a new trade.
There is also no API to read or write anything other than trade posts and trade post comments.
I'll see if I can figure out how to generate the documentation, it's...
Hi,
Sadly no such option exists at this time, but you can use the "Rebuild" feature in the Maintenance page to rebuild most events after having re-configured them in XenForo.
Sorry I couldn't bring better news :(