I'm still reaching the domain with an invalid certicate. You can try it using this URL: https://www.sandbox.paypal.com/cgi-bin/webscr?rm=2&cmd=_xclick-subscriptions&business=mysite-business%40paypal.com&charset=utf-8¤cy_code=EUR&a3=9.9&p3=1&t3=M&src=1&item_name=Abbonamento%20esercente&return=https%3A%2F%2Fmysite.d-one.cloud%2Fesercenti%2F%3Fpage%3Dlogin%26action%3Dlogin%26token%3D3eaeae5d20a82ce33f82d5e4f848e774&cancel_return=https%3A%2F%2Fmysite.d-one.cloud%2Fesercenti%2F I can see the payment details, I click NEXT and I see the login form. As soon as I enter my sandbox credential, Firefox throw a SSL_ERROR_BAD_CERT_DOMAIN error for this URL: https://www.sandbox3.paypal.com/it/cgi-bin/webscr?cmd=_ul-xclick-subscriptions&SESSION=...&flowType=subscription
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