I'm trying to set up PayPal on my site, and when I'm in Sandbox, it goes to the login screen and tells me my credentials is wrong, but when I input the live API credentials, the PayPal screen pops up, stays blank for a few seconds and then closes again. I've been fiddling with this for hours and just getting frustrated, and very close to just removing TB at this point. Can someone help me with making it so that PayPal will work on my site, then redirect back to a download page?
Also, is there a way to remove the address requirement to checkout? I sell digital files, and couldn't care less about their address.