I really appreciate you sharing this tutorial, just wanted to point out a couple things.

In order to give the manage_pages and publish_pages permission Facebook requires that you send a screencast of showing off how the app works for someone in the review team to check the process. I'm assuming the app won't work without those permissions, so there is a catch 22 situation here. Maybe Facebook hasn't realized yet they have an imposible requirement.

Also, they require specifying a platform, so I selected website, since it's the one that seems less complicated to setup, since other options like mobile app or Facebook game might require some other information that I don't have at hand.

For getting the Access Token once I've entered the website information, they require passing the website URL as a parameter and the clientid parameter was renamed to clien_id, but when I pass all that information I get the error shown bellow, even when I've already added the domain to the app settings:

Can't load URL: The domain of this URL isn't included in the app's domains. To be able to load this URL, add all domains and sub-domains of your app to the App Domains field in your app settings.

Keep up the good work.

I found this error when running the script. I couldn't find the solution for it.

I wonder whether is posible to have the bot to auto reply to tags (aka mentions) on any post, is that posible?

Keep up the good work.