You're right, I went through and renamed some sections. I did that to reduce confusion, because there are a bunch of parts where the pandoc docs talk about things that don't make sense when you're POSTing instead of using command line options. I did give attribution at the bottom in the Authors section.

You'd generally pay for a service like this if you're running on Heroku or another PaaS and don't want to have to deal with getting Pandoc and various other supporting tools up and running.