Method validate

app/src/Licensing/LemonSqueezy.cpp:265–299

* @brief Validates the current license key and instance ID. */

 * @brief Validates the current license key and instance ID.
 */
void Licensing::LemonSqueezy::validate()
{
  if (!canActivate())
    return;

  if (busy())
    return;

  m_busy = true;
  Q_EMIT busyChanged();

  QJsonObject payload;
  payload.insert("license_key", license());
  payload.insert("instance_id", instanceId());

  auto url         = QUrl("https://api.lemonsqueezy.com/v1/licenses/validate");
  auto payloadData = QJsonDocument(payload).toJson(QJsonDocument::Compact);

  QNetworkRequest req(url);
  req.setTransferTimeout(15 * 1000);
  req.setHeader(QNetworkRequest::ContentTypeHeader, "application/vnd.api+json");
  req.setRawHeader("Accept", "application/vnd.api+json");

  auto* reply = m_manager.post(req, payloadData);
  connect(reply, &QNetworkReply::finished, this, [this, reply]() {
    if (reply->error() != QNetworkReply::NoError)
      qWarning() << "[LemonSqueezy] Validation network error:" << reply->errorString();

    readValidationResponse(
      reply->error() == QNetworkReply::NoError ? reply->readAll() : QByteArray(), false);
    reply->deleteLater();

    writeSettings();
  });
}

/**
 * @brief Deactivates the license on this machine; an offline certificate routes