Below is a diagram illustrating the workings of the DIBS Payment Window.

The DIBS Payment Window is started as follows. An HTML form (method POST) calls:
https://payment.architrade.com/payment/start.pml
The section "Payment Window as a Pop-up" has an example on how to do this. If you have problems starting the pop-up, we provide two small scripts in ASP and PHP to aid you.