It sounds like it is not going to use NWC, so the subscribers will still have to authorize payments each month (or prepay them), however it BTC Pay is going to give you an option send them a reminder.
Even so, I'm pretty interested in this!
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This is the perfect blend of recurring billing/subscriptions mixed with push payments.
WOW....that's great.......I've been waiting for this for a long time...!!!
https://xcancel.com/NicolasDorier/status/1964994962090823961