I see this package can be used for "Website payment pro", but can it also be used for the express checkout?
I ask since "Website payment pro" is only available in the UK/US, and express checkout is the only available solution for the rest of the world when developing server-server solutions based on paypal.
Otherwise the project looks really interesting, and I'm looking forward to testing it on my project if it can be used with express checkout.
This library does Express checkout as well. I have used it for a project of mine.