Payments. Need to set custom transaction reference if total to pay is 0

[DmS]

Hi.
I have implemented a payment provider, and I need to handle the case where the order is paid in full by a voucher, ie 0 to pay.

I've read through this thread: viewtopic.php?f=15&t=3717&p=14812&hilit ... ero#p14812 and understand that the Standard.php in the aimeos vendor folder client/html/src/Client/Html/Checkout/Standard/Process/ controls this by returning null in that case and setting payment status to authorized, and through this bypasses the process code in the custom payment provider which would otherwise setup the payment form etc.

This is fine, but in the thank you page I end up at, the transactionReference that I normally get from the payment call is missing since the call is never performed. To solve this, I need to set a custom transaction reference, but can't figure out how to do that since the payment provider class is skipped in this case.

My thought was to override the Standard.php and solving it in there, tried it by adding it to the ext/<name>/client/html/src/Client/Html/Checkout/Standard/Process/ folder , just as with templates etc, but it never gets called. Only the one in the aimeos vendor path is called

How should I go about this in a simple way?

[aimeos]

Why don't you just test for the transation reference parameter and if it's not there, do nothing?