Generally speaking, yes, your app will be rejected. According to section 11.2 of the App Store Review Guidelines for iOS (Login Required) any app that doesn't use In-App purchase will be rejected.
11.2 Apps utilizing a system other than the In App Purchase API (IAP) to purchase content, functionality, or services in an app will be rejected Additionally, note that any purchase of real world goods or services is not allowed as per section 11.3. I suggest reading the whole document, or at least section 11 (and 20 if it's a charity app). That should give you a pretty good idea of what's allowed and what's not.
If you are purchasing digital content for use within the app you must use in-app purchase ,for real goods like book ,pencil,Cd you can use PayPal.

Generally speaking, yes, your app will be rejected. According to section 11.2 of [the App Store Review Guidelines][1] for iOS (Login Required) any app that doesn't use In-App purchase will be rejected.
> 11.2 Apps utilizing a system other than the In App Purchase API (IAP) to purchase content, functionality, or services in an app will be rejected
Additionally, note that any purchase of real world goods or services is not allowed as per section 11.3. I suggest reading the whole document, or at least section 11 (and 20 if it's a charity app). That should give you a pretty good idea of what's allowed and what's not.

[1]: https://developer.apple.com/app-store/review/



If you are purchasing digital content for use within the app you must use in-app purchase ,for real goods like book ,pencil,Cd you can use PayPal.