Hi,
I don't see the link between the HikaSerial-Acymailing integration and the process steps you described.
But I think that I understand the issue you have.
HikaSerial have an integration plugin with Acymailing which allow to generate dynamically serials when Acymailing is sending an email (thanks to a tag in the newsletter).
The goal is to generate the serials dynamically and because the users might not have a Joomla account ; the serial cannot be assigned to a user.
The plugin cannot retrieve serials from the database, it needs to create them using a generator.
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.