Real time sync

Hello,
Plugin is cool!
I need a feature that is not currently present in your plugin, but would provide me mega help.
I am using ap lugin that creates custom post types – they are numbers for attribute stock. (Plugin is free as lite called “Attibute Stock”.
So when on one site someone orders an item, that reduces this custom post type. ut unfortunately this is not synced in real time – so without myself manually editing this number.
Can you please help me with this? So asap this custom post type changes, it is immediately synced with other site?
If it is available as extra developement, would you be so kind please to let me know the cost?
thank you!