We have three different forms of distribution for our SaaS (Web, Android and iOS) all currently reviewed and in-store in their free form ($0).
Our business model is focussed around a single subscription across all platforms and was hoping to use our existing system of Stripe > Webhook to updates all services of a users status.
Heads down in the development has overlooked the very confusing, constantly changing and expensive (70/30 split!) guidelines that Apple publishes.
We've developed blindly as looking at apps like Dropbox and many others offer the same subscription / account across all platforms.
My questions is how are they doing it? IAP? External subscription? From the guidelines you are not allowed to link to a 'Buy / Subscribe' button.