SSJS: LogUnsubEvent Mangement

<script runat="server" language="javascript">

  Platform.Load("core", "1");

  try {

    var emailAddress = Variable.GetValue("@email"),

        preferenceDE = Variable.GetValue("@PreferenceCenter"),

        preferenceDEKey = Variable.GetValue("@PreferenceCenterKey"),

        jobID = Variable.GetValue("@jobId"),

        batchID = Variable.GetValue("@batchId"),

        listID = Variable.GetValue("@listId"),

        memberID = Variable.GetValue("@memberId"),

        emailName = Variable.GetValue("@emailname"),

        unsubscribe = Variable.GetValue("@unsubscribe");

    var prefDE = DataExtension.Init(preferenceDEKey);

    var filter = { Property: "Email", SimpleOperator: "equals", Value: emailAddress };

    var dataRows = prefDE.Rows.Retrieve(filter);

    if (unsubscribe === "true") {

      unsubscribeRequest(dataRows, memberID, emailAddress, jobID, listID, batchID);

    } else if (unsubscribe === "false") {

      updateSubscribers(dataRows, memberID, emailAddress);

    }

  } catch (e) {

    Write("Error: " + Stringify(e));

  }

  // Unsubscribe Event - update subscriber status to unsubscribe

  function unsubscribeRequest(dataRows, memberID, emailAddress, jobID, listID, batchID) {

    var prox = new Script.Util.WSProxy();

    for (var i = 0; i < dataRows.length; i++) {

      var subKey = dataRows[i].SubscriberKey;

      var props = [

        { Name: "SubscriberKey", Value: subKey },

        { Name: "EmailAddress", Value: emailAddress },

        { Name: "JobID", Value: jobID },

        { Name: "ListID", Value: listID },

        { Name: "BatchID", Value: batchID },

        { Name: "Status", Value: "unsubscribed" },

        { Name: "Reason", Value: "Preference Center Unsubscribe" }

      ];

      prox.setClientId({ "ID": memberID });

      var data = prox.execute(props, "LogUnsubEvent");

      Write("Unsubscribed: " + subKey);

    }

  }

  // Update Subscriber Status - update subscriber status to active

  function updateSubscribers(dataRows, memberID, emailAddress) {

    var prox = new Script.Util.WSProxy();

    for (var i = 0; i < dataRows.length; i++) {

      var subKey = dataRows[i].SubscriberKey;

      var props = [

        { Name: "SubscriberKey", Value: subKey },

        { Name: "EmailAddress", Value: emailAddress },

        { Name: "Status", Value: "active" }

      ];

      prox.setClientId({ "ID": memberID });

      var options = { SaveOptions: [{ 'PropertyName': '*', SaveAction: 'UpdateAdd' }] };

      var resp = prox.createItem("Subscriber", props, options);

      Write("Updated Subscriber: " + subKey);

    }

  }

</script>