Hi,
I am the developer of the Stripe Subscription Plugin. I designed it to model the Paypal Plugin, and it works by limiting access to groups, that therefore limit access to individual threads. It sounds like you want to restrict access to the entire site through a paywall and I believe this would require a different permissions approach than the groups model that the stripe plugin currently uses. For specifics you might want to directly ask the NodeBB developement Team.
Best,
Ed