I'm trying to run the csharp example from https://github.com/amzn/amazon-pay-sdk-samples.
I edited the appSettings in Web.config and set the values to my keys.
Then I changed the widget-URLs to the european https://static-eu.payments-amazon.com/OffAmazonPayments/eur/sandbox/lpa/js/Widgets.js
The login with parameter popup:true doesn't work. I only get to see a page with a text like 'An error occured. We are working on this.'
Setting popup to false lets me enter a username and password, but the params of the target page are then sent with a # instead of ? as delimiter, so the server-code won't see them...
Are there any other settings I have to change?