How do I determine which type of account a person has when using the permissions api? I need to make a different decision if they have a pro account versus a standard business account. Thanks!
I'm not aware of any way to see that via the API.  That's typically something you'd leave up to the end-user to know when they're signing up.  Ask them if they have Pro or not, and based on that, setup your permissions request accordingly.
PayPal Classic APIs determine account type