Facebook App with PUN?

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Heya :D

just started developing with Unity a few month ago and now its time to go multiplayer. For the start I'm focusing on developing a small facebook App to play around, made in Unity and accesible from Web and Android. After watching several guides and reading through all tutorials (facebook and pun sided), I cannot figure out how to set up the properties in FB and Unity to get it working. My last problem was getting the binary URL from Unity to setup on the FB developement page.
Just started asking myself if I'm missing something really important? Do I need a Photon Server (or anything else) to go Web-Based? I'm appreciating any answers regarding "Getting Started", Facebook und PUN. Thanks in Advance

Struck - 2nd Semester GameDesign at MDH Düsseldorf

edit: I want to use Photon Cloud