Submission policies for B2B subscription based app (free download, charged outside)

Hello! Question related to app store submission. If you have a B2B app that allows free downloads from the app store and charges the client outside of the app, what Apple policies/ restrictions should you adhere to? If anyone else does this, did you list your app as a "Reader" app in this case? TIA!

Submission policies for B2B subscription based app (free download, charged outside)
 
 
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