Hi there
On my setup i changed both the verification and payment URL to be the same --- https://www.paypal.com/cgi-bin/webscr/
That gets me to the right paypal page and the user see the cart and is asked for a CC number or to login.... good so far....
When i went through the sand box I put in an invalid card number and the error message was in german... so need to check that out because i'm in AU
Also, with these settings all purchases appear to be flagged as "awaiting shipment" in the store admin module even when no payment was done, so I would think the verification URL is probably wrong.
I have bought a simple PayPal Button module for quick/easy payments, it's verification URL is an ASPX module located in the desktopmodules/gumbosoft/verifyIPN.aspx on the my website (makes sense). (this is a good cheap quick module too, from gumbosoft)
So I checked the desktopmodules/store directory for a module that looks like it might be able to verify a postback from paypal - i couldn't find one, but that doesn't means it's not buried in the code somewhere ??? maybe you guys can find it...
Hope this helps
I've decided to look for another store/shop - i searched dotnetnuke marketplace under store and shop and found these
http://marketplace.dotnetnuke.com/p-540-smith-shopping-cart2.aspx -- looks good only 99 dollars
http://marketplace.dotnetnuke.com/p-682-alicommerce-shopping-cart20.aspx - looks good too 195 dollars
http://marketplace.dotnetnuke.com/p-727-paypal-storefront21.aspx --- or this one at just 49 dollars
good luck fellows
Peter