Re-authenticate using jwtFn

index.html

<script type="text/javascript">
window.zESettings = {
  webWidget: {
    authenticate: {
      jwtFn: function(<callback>) { // for help center authentication
        // Fetch your jwt token and then call our supplied callback.
        callback('YOUR_JWT_TOKEN');
      },
      chat: {
        jwtFn: function(<callback>) { // for chat authentication
          // Fetch your jwt token and then call our supplied callback.
          callback('YOUR_JWT_TOKEN');
        }
      }
    }
  }
};
</script>