import co.novu.common.base.Novu;
import co.novu.api.subscribers.requests.UpdateSubscriberPreferenceRequest;
import co.novu.api.subscribers.responses.SingleSubscriberPrefResponse;

public class Main {
    public static void main(String[] args) {
        String apiKey = "<NOVU_API_KEY>";
        Novu novu = new Novu(apiKey);
        String subscriberId = "<SUBSCRIBER_ID>";
        String templateId = "<TEMPLATE_ID>";

        PreferenceChannel channel = new PreferenceChannel();
        channel.setType("<TYPE>");
        channel.setEnabled(true);

        UpdateSubscriberPreferenceRequest request = new UpdateSubscriberPreferenceRequest();
        request.setEnabled(false);
        request.setChannel(channel);

        SingleSubscriberPrefResponse response = novu.updateSubscriberPreferences(request, subscriberId, templateId);
    }
}

{
  "data": {
    "preference": {
      "channels": {
        "chat": "boolean",
        "email": "boolean",
        "in_app": "boolean",
        "push": "boolean",
        "sms": "boolean"
      },
      "enabled": "boolean"
    },
    "template": {
      "_id": "string",
      "critical": "boolean",
      "name": "string"
    }
  }
}