PayPal have committed to a longer signing key length and part of this is in the need to upgrade your SSL and CURL stack to support TLS 1.2 and HTTP/1.1, this will hit most people via the IPN acknowledgement call back. Why the longer key length? Basically over time the ability of computers to ‘crack’ a Read more about PayPal SSL upgrade to TLS 1.2 and HTTP/1.1[…]