title: How to get token of currently rendered document in screen?
body: <p>My <code>pause</code> handler handles pause action from multiple cards. Here is my <code>PauseHandler</code> looks like,</p>
  <pre><code>    @Override
      public Optional&lt;Response&gt; handle(HandlerInput input) {
                  
          List&lt;Command&gt; commands = new LinkedList&lt;Command&gt;();       
          ControlMediaCommand pauseVideoCommand = ControlMediaCommand.builder()
                  .withCommand(MediaCommandType.PAUSE)
                  .withComponentId(PLAYER_COMPONENT_ID).build();
          commands.add(pauseVideoCommand);
  
          ExecuteCommandsDirective executeCommandDirective = 
                  ExecuteCommandsDirective.builder()
                  .withToken(Constants.DOCUMENT_TOKEN)
                  .withCommands(commands)
                  .build();
          
          String speechText = &quot;Okay&quot;;
          return input.getResponseBuilder()
                  .withSpeech(speechText)
                  .addDirective(executeCommandDirective)
                  .build();
         }
  }
  </code></pre>
  <p>Now my pause handler needs to handle <code>pause</code> via voice for another APL document. I'm trying to figure out if there is a way to uniquely identify the document (something like token) while handling pause so that i can choose appropriate action for pause.</p>