Cancel an SMS Campaign

{
    "data": {
        "body": "This is an awesome message.",
        "custom_string": null,
        "date_added": "1444959876",
        "from": "+61353787447",
        "ip_address": "192.168.10.1",
        "list_id": 428,
        "name": "Awesome campaign.",
        "schedule": "1444821615",
        "sms_campaign_id": 1,
        "source": null,
        "status": "Cancelled",
        "subaccount_id": 1,
        "user_id": 1
    },
    "http_code": 200,
    "response_code": "SUCCESS",
    "response_msg": "Your SMS Campaign has been cancelled."
}