Purchases within the App Store:
Commission of 25% (general) or 10% (special programs)
5% fee if you use Apple’s payment system
App purchases on the App Store, but directed outside the store:
No fee if the routing involves static text (no clickable link/button)
15% fee if the owner of the app puts a button/link and directs to payment on his own website (outside the app environment)
Alternative stores:
5% of Core Technology Commission