I'm trying to follow steps in this official documentation: https://developer.paypal.com/webapps/developer/docs/classic/express-checkout/ht_ec_fundingfailure10486/
After near 6 hours of research, I finally managed to create an account from developer.paypal.com that could be accessible from sandbox.paypal.com. Since all changes were made to the developers side, testing is more than a pain and it's harder than before, when it was not easy either.
Well, so I'm now logged into my sandbox.paypal.com account and I want to edit my credit card address as pointed in the tutorial:
Replace the contents of the street address Line-1 of the buyer's test credit card, with CCREJECT-REFUSED.
When I click on the "Edit" card link, inside my profile in PayPal's Sandbox page, all I get is a blank page.
Does anyone have a workaround for this bug? Thank you.