One page publishes a new post every day (this is not my page). I would like to integrate this with slack and display the content of the post in the messenger. How can I download such posts using facebook api?
When I'm trying to call GET /{page-id}/feed it requires 'Page Public Content Access' - is it mandatory?
Yes, you do need to apply for Page Public Content Access if you want to access data of Pages you do not own - no matter if the data is public on facebook.com.