Hi,
HikaMarket base system is to set commission on the vendor sales.
If you want to charge for the subscriptions, the best is to use a subscription system and the settings in HikaMarket for the "automatic vendor creation" on specific Joomla user group.
So when the vendor subscription expired, the subscription system will remove the user from the ""vendor"" user group and it will unpublish the vendor in HikaMarket (by the way, it will hide the vendor products in the front-end).
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.