Hi,
We had little problems with the latest build, we updated the package and our demo website.
I have made some tests and we will make others. The bug should be fixed now.
HikaShop have a lot of payment plugins, including paypal.
Having a SSL in your website could add some security but we have some payment methods which does not require SSL (and are secure).
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.