I am requesting authorization via https://www.facebook.com/v13.0/dialog/oauth?client_id=CLIENT_ID&redirect_uri=http://localhost:4000/authorization/instagram/

In response to the redirect url, an access code comes

How to use it to access the instagram accounts of the facebook page through which the login was made? It's just messed up with a bunch of different tokens, I can't make it out 🙁

I eventually need access to the user's instagram pages to post to these pages through my service

As I understand it, everyone will have a token that will need to be updated on the server from time to time