What options are available for bulk-purchasing of a Freemium app?

I am building a Freemium app. So some of the functionality will be locked behind a paywall. Ideally the way a user would unlock the additional features is by purchasing an in-app purchase.

However the main target audience for the app will be companies, so I want to make use of Apple Business Manager to allow for bulk purchasing of my app. The problem is I am unclear on whether Business users will be able to bulk-purchase the In-App Purchases to unlock the app's premium feature, or whether my only option is to release a completely unlocked version of the app for Business customers?
What options are available for bulk-purchasing of a Freemium app?
 
 
Q