. 11.5 Apps that use IAP to purchase credits or other currencies that expire will be rejected . 11.6 Content subscriptions using IAP must last a minimum of 30 days and be available to the user from all of their iOS devices . 11.7 Apps that use IAP to purchase items must assign the correct Purchasability type . 11.8 Apps that use IAP to purchase access to built-in capabilities provided by iOS, such