Hi,
HikaSerial structuration is like a toolbox where plugins can generate (consume, control) the serials.
HikaSerial have already a "time limited" plugin which generate a code with a limited time ; so the customer have a limit period of time to perform the consumption of the plugin.
Using a custom plugin, you can generate the content you want for your serials.
Afterwards, you can also control how the serial is display ; so you can decide to not display the serial after a serial period of time (but knowing that the content will be send via email ; a customisation of that part will be required).
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.