Paypal will discontinue supporting 1024-bit key length certificates and will migrate to 2048-bit certificates before the end of 2013.

Many merchants are getting email notices from PayPal that PayPal is migrating to 2048-bit SSL certificates between July-December 2013 and are asking us if there is any effect on their sites or any actions that they need to take –

** Please note – The architecture of Zen Cart is unaffected by this change and no action is required either by the Store Owner or by us.