Sorry, but something bugged and the settings for the payal account were lost, I've put back what I think should work, but you'll need to put in the paypal id, preferably you should use a developer sandbox account for testing.
However I notice that your running DNN7.1.1. There are known issues with urls in this version, it also looks like you have "advanced" urls on as well????
First thing you must do is update to the latest version of DNN. And also if possible change the url rewriter to "humanfriendly", IMO the advanced url rewriter should never have been made default, it's too unstable, but at least in DNN7.2.2 it does seem to be better!
However I notice that your running DNN7.1.1. There are known issues with urls in this version, it also looks like you have "advanced" urls on as well????
First thing you must do is update to the latest version of DNN. And also if possible change the url rewriter to "humanfriendly", IMO the advanced url rewriter should never have been made default, it's too unstable, but at least in DNN7.2.2 it does seem to be better!