It is not possible to purchase an enterprise app directly from the Apple App Store. To do this, you must redeem an App Store code once*.
To generate such a code, visit the HR Kiosk on a BASF computer. Then navigate to the following location:
BASF SE:
Employees -> Work Environment -> HRdirekt App
Germany:
Employees -> My data -> HRdirekt App
For installation on a managed Apple (iOS) device, please use the BASF Corporate Portal.
*it may happen that the Apple App "iTunes Store" (installed by default) is required.