My (live) iOS app is a web app that displays my website, along with some native functionality. The website will soon have a paid premium version with extra features.
Let's say someone buys a subscription while using the website in a regular browser. Am I now allowed to give that person access to the website's premium features when they later view the website via the app? The payment, of course, will not have been via the App Store since it was done in a regular browser.
I have seen this rule "Apps that unlock or enable additional features or functionality with mechanisms other than the App Store will be rejected." However, in my case the unlocking is not happening in the app, but on the browser-website.