Fantastic work John!
The membership feature looks amazing and I honestly am very impressed by your landing page since I work on something a bit similar :).
The Stripe Billing integration sounds exciting, but I am curious about the 0% transaction fees. Stripe usually takes 2.9%+30c on charges and Stripe Billing costs 0.4$ (free for the first $1M so we can ignore that).
Did you negotiate some kind of a special deal with Stripe or the 0% means that YOU don't take additional fees, but Stripe fees are still there?