This method uses redemption codes to allocate the content to devices, and it does not support revoking the codes from Apple iOS devices. Once the redemption code is redeemed, it cannot be recycled. Also, Workspace ONE UEM cannot delete content bought using redemption codes off devices.
Devices older than Apple iOS 7 must use this method for purchasing VPP content because the managed distribution is not available for older systems.
You cannot use redemption codes for macOS systems.