Retrieve a custom field value

{
    "fieldValue": {
        "contact": "0",
        "field": null,
        "value": null,
        "cdate": "2018-09-18T10:30:31-05:00",
        "udate": "2018-09-18T10:30:31-05:00",
        "links": {
            "owner": "https://:account.api-us1.com/api/3/fieldValues/2/owner",
            "field": "https://:account.api-us1.com/api/3/fieldValues/2/field"
        },
        "id": "2",
        "owner": null
    }
}
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