Retrieve links associated to campaign

{
    "links": [
        {
            "campaignid": "1",
            "messageid": "3",
            "link": "open",
            "name": "Read Tracker",
            "ref": "",
            "tracked": "1",
            "links": {
                "campaign": "https://:account.api-us1.com/api/3/links/1/campaign",
                "message": "https://:account.api-us1.com/api/3/links/1/message"
            },
            "id": "1",
            "campaign": "1",
            "message": "3"
        },
        {
            "campaignid": "1",
            "messageid": "0",
            "link": "open",
            "name": "Read Tracker",
            "ref": "",
            "tracked": "1",
            "links": {
                "campaign": "https://:account.api-us1.com/api/3/links/2/campaign",
                "message": "https://:account.api-us1.com/api/3/links/2/message"
            },
            "id": "2",
            "campaign": "1",
            "message": null
        }
    ]
}