I received this when testing out the paypal Standard gateway.
Unable to process payment. Please contact the merchant as the shipping address provided by the merchant is invalid, and the merchant has requested that your order must be shipped to that address.
in settings>stores>payments>paypal standard 2.0
I have
Display Name: PayPal
username: My paypal username/email
url: https://www.paypal.com/cgi-bin/webscr
Please help