Add Facebook posts onbehalf of my users

Hi there,
I want to enable my app users to post on their Facebook pages using my app, just like the automation tools do.

I searched about the Facebook API but still did not understand:

  1. What does Facebook want to allow me to use this API?
  2. What are the correct settings I have to set on the Facebook developer platform?
  3. Where to get the needed values for the OAuth2 User-Agent Flow authentication method (in the API connector) or is this the right method to use?

I also checked some API providers but they only enable me to use their APIs to post on my own pages not to post on behalf of my app users on their pages.

I’m a pet distracted now and just need some guidance or keywords to make my search useful regarding Facebook API or to find API providers that offer this possibility. Any help will be very appreciated :pray:

I got this working for now: