'How does the Zoom app manage to pass the AppStore review without In App Purchase

I have developed and submitted an app that is very much like Zoom to the AppStore review. Unfortunately, I got rejected by them mentioning that I must include "In-app purchase" to the app to purchase "meeting subscriptions". But in my app "meeting subscriptions" purchases are in a web portal outside the app same as Zoom. That subscription packages are used to increase the number of participants in the meeting and it does not unlock any feature in the app. So, does anyone have any idea what was the guideline followed by 'Zoom' to pass the App Store review?



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