Awesome job -- as a dev who uses Stripe, this looks great and I'll probably purchase it regardless of the below answers.

A few questions/comments:

1. Is it a flat $1.99? Is there IAP? Why isn't this on the splash page?

2. A demo video -- even a simple, short one -- would be great.

3. Is there a level of granularity available? I.E. I'd love to get 'paged' (push notified) when a customer cancels a subscription or a card is denied, but not necessarily every time there's a successful charge.