Express checkout 1_2 pages in General Add-Ons Support Posted April 5, 2020 thank you very much for your interest, as it is I think we have to use confirmation page for some of payment modules ii am trying to figure out how to overcome this problem. just thinking out loud, maybe the confirmation.php canbe moved in the payment_ajax.php Invoice.php: this is not an invoice. at this stage there is no payment made, so it is just a pre order. So it is only usable for this add-on. there is no point in separating it. either have it or not. so I left it as a choice.