{
    "type": "object",
    "properties": {
        "id": {
            "type": "integer"
        },
        "state": {
            "type": "string"
        },
        "created_at": {
            "type": "string"
        },
        "referrer": {
            "type": "null"
        },
        "subscribable_id": {
            "type": "integer"
        },
        "subscribable_type": {
            "type": "string"
        },
        "subscriber": {
            "type": "object",
            "properties": {
                "id": {
                    "type": "integer"
                },
                "email_address": {
                    "type": "string"
                },
                "state": {
                    "type": "string"
                },
                "created_at": {
                    "type": "string"
                }
            },
            "required": [
                "id",
                "first_name",
                "email_address",
                "state",
                "created_at",
                "fields"
            ]
        }
    },
    "required": [
        "id",
        "state",
        "created_at",
        "source",
        "referrer",
        "subscribable_id",
        "subscribable_type",
        "subscriber"
    ],
    "version": 1
}