How to resolve rejection on App store with In-App purchase, free trial and links of web application
Remove Indirect Links

You need to remove every link from the privacy policy and terms of conditions pages. Any link from these pages can indirectly lead to your alternative payment methods.

The key phrase in Apple's response is:


  …that could indirectly provide access…


Any link in or from your app should be carefully checked for ongoing links.

Multiple Payment Methods

A service accessed non-exclusively through an iOS app can support multiple payment methods. From within the iOS app, the only method of payment can be through Apple.