Freshdesk Oauth template variable error

gistfile1.js

(function() {
  "use strict";
  return {
    initialize: function() {
      var self = this,
        headers = { Authorization: 'bearer <%= access_token %>'},
        reqData = { headers: headers, isOAuth: true },
        url = 'https://requestb.in/xnxqp7xn';

      this.$request.get(url, reqData)
        .done(function(data) {
          console.log(data);
        })
    }
  };
})();