In-app-purchase,

• 
  11.2
  
  Apps utilizing a system other than the In-app Purchase APIs (IAP) to Purchase content, functionality, or services in an APP would be rejected
• 11.3
  Apps using IAP to purchase physical goods or goods and services used outside of the application would be rejected
• 11.4
  Apps that use IAP to purchase credits or other currencies must consume those credits within the application

11.2. The use of non-IAP third parties in the APP to pay for the purchase of content or services, the unlocking function is not allowed, 11.3 said it is not permitted to purchase goods or services in kind or application with IAP; 11.3 said currency purchased via IAP must only be used within the App.

We'll know where the problem is. 11.2 tells you not to use third-party payments to purchase content used within the app inside the iOS app, and 11.3 tells you not to use the IAP to purchase items that are used outside of the app, which can be coincident, that is, content that can be used inside and outside of iOS or Service, these two audit rules do not specify which rule the coincident part applies to.

In-app-purchase,