Facebook full permission AccessToken alternative to Offline access token

Question

Currently I am using desktop windows service to download my Facebook page insights/ page likes/friends etc. graph data . so, for that i have added app on my facebook page an

Answer 1

Simple solution just call following functions using PHP SDK

$facebook->setExtendedAccessToken();

and after it get extented access token through

$access_token = $facebook->getAccessToken();

OR

GET /oauth/access_token?  
    grant_type=fb_exchange_token&           
    client_id={app-id}&
    client_secret={app-secret}&
    fb_exchange_token={short-lived-token}