session_start();

$model = new DemoInvoice(new Persistence\Array_($_SESSION['atk4_ui_intro_demo'] ?? []));
$model->onHook(Model::HOOK_AFTER_SAVE, static function (Model $model) {
    $_SESSION['atk4_ui_intro_demo'][$model->getId()] = (clone $model->getModel())->addCondition($model->idField, $model->getId())->export(null, null, false)[$model->getId()];
});

Header::addTo($owner, ['Record display in Card View using model data.']);
$model = $model->tryLoad(1);
if ($model !== null) {
    Card::addTo($owner, ['useLabel' => true])
        ->setModel($model);
} else {
    Message::addTo($owner, ['Empty record.']);
}