Hello,
The HikaShop points payment plugin is not a classical payment plugin.
If you're using the plugin in "virtual coupon" mode, HikaMarket won't have the possibility to add a payment restriction since that plugin won't act as a payment plugin (a method that you can choose during the checkout).
If you use the other mode, you'll see the payment method but the way the plugin is working is not very "friendly".
We had some discussion with the HikaShop team in order to know if that plugin should be removed from the payment plugin to be move in another category. The virtual coupon mode is the most used configuration but is not acting as a payment plugin.
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.