Hello,
No I don't know how Jomres is working but for what I can see ; the "subscription packages" are just "plans". That's why creating a plugin to handle Jomres Subscription packages is not something useful since the subscription would be handle by HikaSubscription.
So ; would it be possible to have an explanation about what you want to achieve exactly ?
About the "subscriber" plugins, there is for the moment two plugins which can be used as "sample".
The first one is regarding the Joomla user groups and the second one to connect with Acymailing.
There is for the moment no documentation since a subscriber plugin still have some complex parts to be able to process several subscriptions in the same time (regarding the cron-task processing) and also have some code to no perform the "expiration" action if the customer have another valid subscription.
We hope that with future subscriber plugins ; we will provide a more simpler PHP interface for that kind of 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.