I recently set up Paypal payments standard on my web app and things are working fine. I am able to use Paypal sandbox to test and things work the way I expect.
However, I would like to send out the app to my beta testers and allow them to test making payments without actually using their Paypal accounts or credit cards. I can create sandbox merchants and sandbox payees, but that doesn't quite do it. My button send them to sandbox.paypal.com... but when they get there they are asked to log in with a developer/sandbox password. It doesn't just let them login with the test payee account.
I can work around this, but I wanted to see if I was missing something.