Currently user only permissions are available please make application permissions available to allow us to make enterprise level apps.
I just ran into this limitation, I registered an app ID and on assigning permissions I found I can only assign delegated ones.
What I wanted was for (anonymous) users of my website to be able to create bookings, so I'd like my server side code to read and write booking details to the Graph API without having to authenticate as a specific user - like when users interact with the published booking page.