The paypal userid doesn't look correct to me. For website payments pro userid is not normally an email address.
If you just put that in there for the post, then the next thing to check is error message being returned from Paypal. On the checkout failure page in the bindings panel you want to add the ecart bindings for local checkout response .
The bind the full response to the page. This will display the error code from Paypal.
Hope that helps.