Use Access Token to Log In

Hi,

I am trying to use an three-legged authentication in my JavaScript application. I have generated an access_token and now am trying to "Log In" using this token...

In the examples given, something like this has been done:

rcsdk.platform()
    .login({          username: '18001234567', // phone number in full format          extension: '', // leave blank if direct number is used          password: 'yourpassword'      })      .then(function(response) {            // your code here      })      .catch(function(e) {          alert(e.message  || 'Server cannot authorize user');      });

where we can collect username, extension, and password from user to log in. If I have an access token, how should I proceed to log in?