Facebook APIs

Generating Graph Access Token that Never Expire

Make sure you are the admin of the FB page you wish to pull info from

Create a FB App using the Page admin's account

Head over to the Facebook Graph API Explorer

Select the FB App you created from the "Application" drop down list

Click "Get User Access Token"

Make sure that "manage_pages" permission is checked

Make a GET request to: https://graph.facebook.com/oauth/access_token?client_id=<App ID>&client_secret=<App secret>&grant_type=fb_exchange_token&fb_exchange_token=<short-lived access token>

Copy the new long-lived token from the response

Make another get request to: https://graph.facebook.com/me/accounts?access_token=<your long-lived access token>

Copy the new token and paste it to Access Token Debug Tool, make sure that it never expires

References- This stackoverflow post