Custom prebid config

{
    "cache": { "url":"https://prebid.adnxs.com/pbc/v1/cache" },
    "priceGranularity": "auto",
    "userSync": {
        "userIds": [{
            "name": "unifiedId",
            "params": {
                "url": "//match.adsrvr.org/track/rid?ttd_pid={YOUR_UNIFIED_ID}&fmt=json"
            },
            "storage": {
                "type": "cookie",
                "name": "pbjs-unifiedid",
                "expires": 60
            }
        }],
        "syncDelay": 3000
    }
}