Hi,
HikaShop send an email when the order is created ; you also have to unpublish that email.
The "order status notification" option in the payment plugin is to send (or not) an extra email when the order status is set to what you selected for the option "order status".
In case where you set the setting to "pending" (for example), you can decide to send an email to the customer for that "pending" status. But because you are using "created" ; the setting "order status notification" have any impact.
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.