Pimcore\Controller\Action\Admin\Printpage::startPdfGenerationAction PHP Method

    public function startPdfGenerationAction()
    {
        $document = Document\Printpage::getById(intval($this->getParam("id")));
        if (empty($document)) {
            throw new \Exception("Document with id " . $this->getParam("id") . " not found.");
        }
        $document->generatePdf($this->getAllParams());
        $this->saveProcessingOptions($document->getId(), $this->getAllParams());
        $this->_helper->json(["success" => true]);
    }