PayPal is one of the most popular payment gateways on the Internet and to meet the need for greater e-commerce security they now require that merchants install an SSL Certificate on their websites. Once the code is installed your domain name will change from “http//www…….” to “https//www…….” Most hosting companies will sell you the SSL. Some hosting companies will also do the code installation at a small fee and sometimes for free. To avoid any loss of service you must verify with PayPal by 6-30-16 that your site is ready with the necessary SSL Certificate installed and configured.
“Merchants and partners use Instant Payment Notification (IPN) to receive notifications of events related to PayPal transactions. The IPN message service requires that you acknowledge receipt of these messages and validate them. This process includes posting the messages back to PayPal for verification. In the past, PayPal has allowed the use of HTTP for these postbacks. For increased security going forward, only HTTPS will be allowed for postbacks to PayPal. At this time, there is no requirement for HTTPS on the outbound IPN call from PayPal to the merchant’s IPN listener.” PayPal