-- HikaShop version -- : 2.6.1
-- Joomla version -- : 3.4.8
is there any way to notify users about products which are about to expire? in 2 ... 1.... days
- as option to notify only users who bought this product before or all users...
You can use AcyMailing mass action system to send a newsletter to such users. You can automate it with the mass actions and filter on the users thanks to the integration filters of HikaShop.