Can I also subscribe to the software through Apple Business Manager?
No, unfortunately Apple currently does not offer the option of making in-app purchases via the Apple Business Manager.
Unfortunately, licensing via an in-app purchase is the only way for us to offer a test phase for the software in the AppStore before subscribing.
For Merlin Project for iPad and iPhone we are unfortunately bound to Apple. The only option is to subscribe to the software via a private Apple ID and then bill the company.
Merlin Project Express is alternatively available through the Setapp subscription service. The only option left in the AppStore is to subscribe to the software via a private Apple ID and then bill the company.