I am hesitating on buying because I am confused.

I have a network of sites (not multisite, different domains) that are connected via myCred (installed in one website),
owned by same company though each site sells different products on its own woocommerce.
Once they buy on any site, the users get points displayed on that central website.

The users can check their points and use them in the unified system (based on myCred).
I have been planning use also a subscription systmem for them offering extra discounts etc and I am happy to noitce you just before the end of the LTD.

Do I need to get one license (and install WPsubscription there and connect through APIs and web hooks) or multiple (if WP subscription requires license per each woo)?