[1] Access Tokens (3/5/2015, 9:07:16 AM 版) <https://developers.facebook.com/docs/facebook-login/access-tokens>
GET /oauth/access_token? grant_type=fb_exchange_token& client_id={app-id}&client_secret={app-secret}&fb_exchange_token={short-lived-token}
GET /oauth/access_token?
grant_type=fb_exchange_token&
client_id={app-id}&
client_secret={app-secret}&
fb_exchange_token={short-lived-token}
Google search: fb_exchange_token