As of June 30, 2017, PayPal Instant Payment Notifications will no longer allow you to use HTTP to post messages back to PayPal for verification. To comply with these changes, all merchants using PayPal must upgrade to Community Edition 1.9.3.3 or apply the SUPEE-8167 patch. Updates must be in place by June 30, 2017 to avoid any service disruptions. The patch is available on the Community Edition Download Page (https://magento.com/tech-resources/download) and more information is available from PayPal at https://www.paypal-knowledge.com/infocenter/index?page=content&widgetview=true&id=FAQ1916&viewlocale=en_US

