title: Handling access tokens expire time
body: <p>I am consuming some web API methods in my MVC projects. What I am doing is creating an API handling class. I am planning to get access token in the constructor of this class and then attaching it to my webapihandler object in the constructor again. Then I will consume several API calls which is fine. However, I think I have to control the expire time of the token before every call and if it is expired then I have to create one. I do not know how to check the expiry time of a token. </p>
  
  <p>This is the first time I am dealing with tokens in such a way and any help is appreciated. </p>