Integrating gravity forms signup with pro sites

Hi,

This is probably a question for the pro sites developer...

I have read the forum post about integrating Gravity Forms User Registration with Pro Sites, but I am doing it a bit differently to the post I read.

Basically, I just want to use that form to sign up and create the site, then do the pro sites payment (by going to /pro-site/?bid=x) as normal, but what functions do I have to call in the Gravity Forms hooks (after site creation, when I have the blogid) to register the site as a pro site?

Regards,
Brendan