Email Germanized

<?php
if ( $invoices = wc_gzdp_get_invoices_by_order( $order ) ) {
    foreach ( $invoices as $invoice ) {
        $invoice_type = $invoice->get_invoice_type();
        if ( $get_title_invoice = $invoice->get_title() ) {
            echo '<p style="margin-bottom:0 !important">'.$get_title_invoice.'</p>';
        }
    }
}

?>

Rechnung on Cancellation PDF

<?php 
echo wp_kses_post( $document->get_parent_formatted_number() ); 
?>