title: How do I request a new refresh token when the last one expired?
body: <p>I have two accounts for docusign, live and demo. The demo one hasn't been used in a while, in fact the last time a refresh token was created was the 14th November. I'm therefore assuming it has expired and is potentially stopping me from getting a new one. </p>
  
  <p>When I make a request I get the invalid_grant error. The same code (with testing credentials) works fine with my live account which requests a live token every couple of days or so. It also did work fine on with the testing credentials until it wasn't used for a prolonged period. </p>
  
  <p>I assumed I need to get hold of a new refresh token but without a valid previous token I'm not sure how to go about this. </p>