Hiya – I have been contacted by PayPal and told there are changes to the way they connect to websites to get payments – specifically Instant Payment Notification (IPN). They told us to look at this (which we did):-
https://www.paypal-knowledge.com/resources/sites/PAYPAL/content/live/FAQ/1000/FAQ1766/en_US/2015%20Merchant%20Security%2 0System%20Upgrade%20Guide%20%28U.K.%20English%29.pdf
Should be looking at installing an SSL Cert on this domain and would I need to change anything afterwards?