in the App Store Review Guidelines is stated in section that \"Apps using IAP to purchase physical goods or goods and services used outside of the application will be rejec
Apple does not take 30% of the transaction if its for physical good.
As stated above for such goods the app needs to use other mechanism then Apple's IAP for taking the money. This answer is verified with apps and companies that I work with.
Other libraries for physical payments for iOS can be: Card IO, PayPal, ZooZ and maybe others.