Get a subscription by RelationshipID

{
  "type": "object",
  "required": [
    "ClientID",
    "UpdateGroupID"
  ],
  "properties": {
    "Active": {
      "type": "boolean",
      "description": "The subscription status.  The status is active by default."
    },
    "ClientID": {
      "type": "string",
      "description": "Read Only after creation. The client id of the subscriber."
    },
    "LastCheckin": {
      "type": "string",
      "format": "date-time",
      "description": "ReadOnly. The timestamp of the last checkin."
    },
    "RelationshipID": {
      "type": "string",
      "description": "Read Only after creation. The relationship id.  A relationship id will be assigned if not provided on creation."
    },
    "UpdateGroupID": {
      "type": "string",
      "description": "Read Only after creation. The update group to subscribe to."
    }
  }
}