![](https://help.apple.com/assets/5C9BC4EA094622BA5AAA5D24/5C9BC4EE094622BA5AAA5D32/en_US/737b1f88fa2bd26732f9d4d59b12a977.png)
About volume purchases
The most scalable method for deploying apps and books is to purchase them in volume through Apple School Manager or Apple Business Manager.
Important: Books from Apple Books must be assigned to a user’s Apple ID account. You can still purchase books, but you must install them with an MDM solution.
If you can’t assign an app, see App-based assignment errors.