use Joomla\CMS\Factory;

$newapp = Joomla\CMS\Factory::getApplication();

$newapp = Joomla\CMS\Factory::getApplication();
$mvcFactory = $newapp->bootComponent('com_content')->getMVCFactory();
$articleModel = $mvcFactory->createModel('Article', 'Administrator', array('ignore_request' => true));

$article = [
    'catid' => 8,
    'com_fields' => array('cvr' => '12345678', 'adresse' => 'Testadresse', 'postnr' => '8000', 'by' => 'Aarhus C', 'telefon' => '33333333', 'webshop-url' => 'https://xxxxxx.dk'),
    'alias' => '',
    'title' => '[username]',
    'introtext' => 'ee',
    'fulltext' => '[cb_description]',
    'created_by' => $user->id,
    'state' => 1,
    'attribs' => '{"article_layout":"","show_title":"","link_titles":"","show_tags":"","show_intro":"","info_block_position":"","info_block_show_title":"","show_category":"","link_category":"","show_parent_category":"","link_parent_category":"","show_associations":"","show_author":"","link_author":"","show_create_date":"","show_modify_date":"","show_publish_date":"","show_item_navigation":"","show_icons":"","show_print_icon":"","show_email_icon":"","show_vote":"","show_hits":"","show_noauth":"","urls_position":"","alternative_readmore":"","article_page_title":"","show_publishing_options":"","show_article_options":"","show_urls_images_backend":"","show_urls_images_frontend":""}',
   'metadata' => '{"robots":"","author":"","rights":"","xreference":""}',
    'language' => '*'
];

        // Make sure that the article gets a unique alias before saving
        if ($article['alias'] == null || empty($article['alias']))
        {
            if (Joomla\CMS\Factory::getConfig()->get('unicodeslugs') == 1)
            {
                $article['alias'] = JFilterOutput::stringURLUnicodeSlug($article['title']);
            }
            else
            {
                $article['alias'] = JFilterOutput::stringURLSafe($article['title']);
            }

            $table = JTable::getInstance('Content', 'JTable');

            while ($table->load(array('alias' => $article['alias'], 'catid' => $article['catid'])))
            {
                    $article['alias'] = Joomla\String\StringHelper::increment($article['alias'], 'dash');
            }
        }

if (!$articleModel->save($article)){
    throw new Exception($articleModel->getError());
}