Invalid messages

[asdfff711]

Hi there,

Really cool chatbot interface!

I'm a student experimenting with chatbots.

Been trying out the webhook feature for flow ai and have been having trouble sending a response back to flow ai. The JSON I'm looking to send is the Carousel one. If you could please take a quick look and identify what's wrong, it will be greatly appreciated. Cheers!

I've referred to https://github.com/flow-ai/flowai-js-templates/blob/master/JSON.md and https://docs.flow.ai/reference/webhook_replies.html.

Been receiving this message:

Webhook
error:Received invalid messages. Please check your JSON data.

This is the format of the JSON response I'm trying to send back.

    "messages": [
        {
            "fallback": "Fallback message here",
            "responses": [
                {
                    "type": "carousel",
                    "payload": {
                        "cards": [
                            {
                                "title": "Item1",
                                "subtitle": "",
                                "media": {
                                    "url": "image1_url",
                                    "type": "image"
                                }
                            },
                            {
                                "title": "Item2",
                                "subtitle": "",
                                "media": {
                                    "url": "image2_url",
                                    "type": "image"
                                }
                            }
                        ],
                        "delay": 0
                    }
                }
            ]
        }
    ],
    "verifyToken": "token_value"
}```