{
    "url": "/contacts",
    "method": "PATCH",
    "body": {
        "contacts": "{{add(emptyarray, parameters.contact_id)}}",
        "remove_campaigns": "{{add(emptyarray, parameters.campaign_id)}}"
    },
    "response": {
        "output": "{{ifempty(body.data.0, body)}}"
    }
}