I'm receiving warning emails from PayPal that they are making root certificate changes for SSL connections for Instant Payment Notifications (IPN).
They are making a number of changes including changing from Verisign G2 (1024-bit) to G5 (2048-bit) certificates and changing from an SHA-1 to SHA-256 hashes.
I'm not sure what actions are necessary by me to remain compatible with PayPal integration.
do I need to contact my hosting provider to explore what changes might be needed in my environment, including possible PHP versions and trusted certificate stores?
since it appears that PayPal integration for Magento is 'built-in' (not an extension) will there be necessary patches to remain compatible with PayPal?