Refresh the access token
     The refresh access token is valid for two hours by default.
  
    If the access token is expired, a new access token can be obtained by using refresh token. These are the parameters used to renew the access token using IFS CE token endpoint.
- grant_type=refresh_token
 - refresh_token
 - client id - Use as the username for HTTP basic authentication
 - client secret - Use as the password for HTTP Bbsic authentication
 
The OAuth client library automatically handles refreshing expired tokens.