Hi,
That won't do. Working on a time constraint like this is complex. I only got to see your message 5 hours after you posted it as I was working on other things. And I'm soon leaving work.
Could you then create another account at Post Finance for test purposes ?
checkout.postfinance.ch/en/doc/api/proce...ostfinance-acquiring
Apparently it doesn't cost anything. That way, you can have two payment methods, one for each postfinance merchant account and then you can configure them independantly.
Similarly with PayPal, you can create a PayPal sandbox account and configure a copy of your PayPal payment method for the sandbox account so that it won't process real payments.
It will be way better to be able to do it like that so that I can do my tests whenever I see your message, without impacting your customers and have all the time I need to investigate, even if we need a bit of back and forth between us (for example, if I need a FTP access, to do some debugging).