Is it permissible to offer free IOS apps backed by paid subscription services?

Hello,

 

I was wondering if it's permissible according to Apple's guidelines and standards to offer free IOS apps that interact with online services that are paid for outside of the Apple ecosystem.  Apps for Netflix and Dropbox, to name a few, seem to suggest this is perfectly reasonable.  I was hoping that someone could point me towards the appropriate standard or guideline that spells this out expliclty.

 

Thanks in advance,

 

Mike

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