Every time I submit the order I just get a javascript alert with "something went wrong :(" No idea if the order went through or not...
Edit: Got an order confirmation via email. However, I really think when you are dealing with payments you should implement a more detailed explanation than a javascript alert of "something went wrong"
I got that too, but immediately after I received an email from swish that stated my order is complete, and that I can check my orders at http://swish.com/login/ (obviously not working right now).
I've not used Swish before and like you said I can't access the login page either. However, I never got any account details so do you know how you would login?
Edit: Managed to get on the page and create an account after some f5 hammering. Turns out all you need to do is create an account with the same email you used in the order and it will display the order status.
We wanted to make checkout easy, but maybe went a little too far. I'll add some more language to the confirmation email explaining what's going on. Thanks for posting the solution.
Edit: Got an order confirmation via email. However, I really think when you are dealing with payments you should implement a more detailed explanation than a javascript alert of "something went wrong"