Hello,
First, I don't see why you're talking about HikaSerial since it's an add-on like other HikaShop add-on. Well!
There is nothing to do or modify in HikaShop for June 30 since the PCI requirement that you're talking about are related to SSL/TLS and that part is in payment plugins/gateways.
If you're using a payment gateway which is not PCI compliant, you won't be compliant.
Otherwise, all payment plugins in HikaShop are designed to the most secured version of encryption when it's possible.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.