Guideline 3.1.1 - In-App Purchase

We noticed that your app contains a payment mechanism other than in-app purchase for digital content or to unlock features or functionality within your app, which is not appropriate for the App Store. In-app purchase is the only valid in-app payment mechanism for digital content.

Note: Continuing to hide functionality within your app or other dishonest acts may result in the removal of your apps from the App Store and termination of your Apple Developer Program membership and all associated memberships.

Next Steps

To resolve this issue, please remove all external or third-party payment mechanisms and implement in-app purchase to facilitate digital good transactions, including unlocking features or functionality within your app.

If you believe your use of an alternative payment mechanism is a permissible use case, please respond directly to this message in Resolution Center with detailed information.

此種拒絕一般是你內部隱藏了支付。比如加了支付寶支付，微信支付等

請刪除掉以後再提交。

如果確實已經刪除了，但是蘋果還是反饋這個問題。

可以試試淘寶上的IPA程式碼掃描。

參考上面的。