Question: Does anybody have a custom payload example for Google Hangouts Chat message?
I'm trying this but no message is displayed:

```js
agent.add(new Payload('hangouts', hangoutsMessage, {sendAsMessage: true}));

```

Thank you.

Answer: 
Double check your `dialogflow-fulfillment` version in your `package.json` if you're using the inline editor in dialogflow. By default, it's set to `0.5.0` so you need to update it.

In package.json:  

`"dialogflow-fulfillment": "^0.5.0"` --> `"dialogflow-fulfillment": "^0.6.1"`
Sending cards or images on Hangouts chat via fulfillment is not working at the moment. Currently you can only send cards, buttons and images on Hangouts via Intent rich messages.

Confirming havokles's answer, Payload, Cards and Images via fulfillment are currently woking on hangouts by updating your package.json's `"dialogflow-fulfillment": "^0.5.0" to "dialogflow-fulfillment": "^0.6.1"`.