Understanding subscription

Hi!

I'm developing an iOS application for one to one consultations with veterinarians.

Basically users will be able to login and create a consultation but will have to either pay per consultation or pay a monthly subscription to be able to join the video call.

I'm trying to understand with Apple terms and conditions if I can a third party payments provider like Stripe to process payment subscriptions instead of IAP.

Any help would be much appreciated to understand this better :)

Thanks!

Understanding subscription
 
 
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