Hello,
The test account you create didn't work, I have this message error :
this means that among your references on your website test something isn't well setted.
So I try to find in the documentation to get the right references but I will be honest the Payway documentation is really difficult to follow.
So can you please, set up with good references the test account in order to have a good start for us to process tests.
I think you can understand that our time is more precious to understand root issue.
Sorry for this return.
regards