We received a notification from PayPal that ipn verification needs to be updated to https. https://www.paypal.com/au/webapps/mpp/ipn-verification-https
But we only use PayPal buttons generated from the PayPal website with some added drop down menus. Does this apply to us?
If you're using the IPN service, then you will need to update it to HTTPS. If not, there is no need for an update.