Generate “never-expire” access token for Facebook Page

Question

I have managed to post to Facebook Page via API (C#), but when administrator of the page logs out, the following error occurs:

\"(OAuthException - #190) Error valida

Answer 1

You can use following api from facebook to refresh token life to 60 days and just when the token is about to expire, call the same api again with-in 60 days to refresh its life back to 60 days from that point of time Token expire is present in expires parameter and its value is in seconds

Replace CLIENT_ID and CLIENT_SECRET with their actual value

https://graph.facebook.com/oauth/access_token?client_id=
&client_secret=&grant_type=fb_exchange_token
&fb_exchange_token=

in ACCESS_TOKEN, put the actual token value without appending "access_token="