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I have the default <email>-facilitator and <email>-buyer addresses in here, but I can't log into them with their assigned passwords.
I also tried defining new ones, <email>+paypalbuyer1 and <email>+paypalmerchant1, hoping to use those instead since these won't require defining a pair of new real gmail accounts (the '+' is ignored by gmail and redirects to the main <email> instead).
If I can't log in, I can't define test buttons can I? The developer site is very confusingly laid out.
Using Vivaldi on Linux x64.
Thanks for reaching out, and welcome to the community!
When logging into https://developer.paypal.com/, you need to use your live PayPal email address and password.
Once you have created your sandbox accounts (which it looks like you've done with the multiple buyer/seller emails added), then you will use those email addresses + passwords to access the PayPal Sandbox at https://www.sandbox.paypal.com. Once you've logged into sandbox.paypal.com, you can create your buttons similarly to how you would on the live site, only the URLs will have sandbox in them, i.e. https://www.sandbox.paypal.com/buttons/.
Hope that clears things up a bit!