title: Instagram access token expire
body: <p>I have an app, that pulls data from my Instagram account. 
  I authorized this app once, and got access token. But I'm worried, 
  what if this token expires? Should I authorized the app each time the 
  token expires? 
  Can I receive another access token from the auth code? 
  If no, what can I do to have my app always pulling data from account 
  without my participation? 
  Thanks. </p>