For all our clients who use PayPal for the provisioning of payments, we have been watching the PayPal Merchant Security Roadmap news and can inform you that deadline for any changes have now changed.
The SSL Certificate Upgrade testing has commenced and will continue until the end of September 2016.
The TLS 1.2 and HTTP/1.1 Upgrade is still required however it will not be mandatory until June 30, 2017.
The IPN Verification Postback to HTTPS can be implemented now however the removal of HTTP callbacks has now been delayed until June 30, 2017.
For more information visit the PayPal Merchant Security Roadmap Microsite.