Hello @MrRieding,
Hope you are doing well.
Documentation, software and other resources supporting this device are secured under NDA (Non-Disclosure Agreement), the information is not public, and it is located under the MIFARE DESFire EV3 Secure Files.
If you already have a valid NDA, you will need to request access to the documentation through Secure Access Rights by following the instructions from this page: Secure Access Rights | NXP Semiconductors. Also, I would recommend checking the Secure Access Rights FAQs | NXP Semiconductors.
Regards,
Eduardo.