Hi,
from my understanding, there are several layers involved for security.
It is not a trivial client server issue. There are several security tokens that have to be obtained from different services.
You probably could use Net Talk client for you communications but there is a LOT MORE involved here - will take a lot of work - you need to understand the communications that are required by Pay Pal and work backwards. I started this challenge but have chosen to look at Noyantis wrappers - just too much going on to screw up and loose hair.
FWIW,
Ron Jolda