Sorry Ray, I just saw your reply.
There really isn't a feature that they need. It's all based on a better rate on the charges. I think the Commerce Platform is something new and PP is promoting it. Honestly, I do not know why the rate is better for the new platform but that's what they said would be required.
Anyway, I have a conference call with PP in a couple of days, and they are going to fill me in on what is required in terms of the api. If you don't mind, I will report back what I find out, then perhaps once my client decides what we are doing, I can make a decision on what help will be needed.