Returns a result with a user's subscription collection. You may pass no params or a date param with the timestamp of your last update. If a date is passed the result will only contain changes to the subscriptions.
{
"msg": "method",
"method": "subscriptions/get",
"id": "42",
"params": [ { "$date": 1480377601 } ]
}{
"msg": "result",
"id": "42",
"result": [
... // subscriptions
]
}