Hi,
In the business edition of HikaShop you can select special registering options like explain in our documentation:
www.hikashop.com/en/support/documentatio....html#checkout_login
In the no-business editions, the default value is set for this option and you can't access to the other modes of registration.
In the checkout, if the user already have a Joomla account, it has to use it.
The registration in HikaShop will create a classical Joomla account, calling the Joomla function for this creation.
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.