echo payment id on invoice

[kratzi]

Hi I am testing on J3.5 and VM 3.0.14

In the template override invoice/invoice_order.php I would like to make a php function but only for one payment id. Therefore I am looking how to call the appropriate id.

In the code there is already a connection to the payment name which is: <?php echo $this->orderDetails['paymentName']; ?>

What would be the correct code to call the payment ID please?

Thank you kratzi