How to get permanent access token.txt

To get a permanent page access token:-
1. call this url with a temporary token.

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


2. Then use the returned token in graph explorer and issue the following request:-
/me/accounts

3. Copy the access token of the respective page and hardwire it in the php code.

4. This code is permanent as can be checked in access token debug tool.