ID cards in Wallet app
The specific feature is support for student IDs and will be available to students in participating universities. As of now three universities Duke University, the University of Alabama, and the University of Oklahoma have it available. Johns Hopkins, Santa Clara and Temple Universities will bring the capability by the end of this school year. 

https://www.apple.com/newsroom/2018/10/apple-adds-support-for-contactless-student-id-cards-in-wallet/

Instructions on how to use this feature if you are a student at one of the universities that has it available can be found here:

https://support.apple.com/en-us/HT208965