Hello,
What you want is let your customer subscribe to a plan which will give us a Joomla user group and thanks to that user group and Joomla ACL system, restrict the content that your users can or cannot see.
There is no trial for HikaSubscription or any other component but we do have a 30 days money back.
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.