I am considering building some paid apps for the App Store.
If I had to deal with payment processors, handling subscriptions, etc. myself there is zero chances I'd do that.
Have you had bad experiences with other payment processors in the past? Honestly curious. I’ve used Stripe, and they are amazing in terms of product quality and customer service.
There are plenty of payment processor platforms other than Apple, if the mobile market was opened, you could checkout if Stripe better suits your needs.