The feature is not yet operational, but within a short time, you can add your college card to the app and use it to move to college.
It was not a new promise, but Apple came to fruition. With the arrival of iOS 12, the North American brand will introduce support for contactless university cards in its mobile operating system. In practice, this means that students at universities with such cards can use their iPhone to move around in college.
The functionality is not yet available and will take some time to arrive. Note that the tool will not work in all educational institutions, but in schools that choose to adapt their cards to these new virtual versions.
More importantly, these digital copies will not replace the physical copy. Both will work equally, since they have exactly the same functionality, which means that you can use the smartphone instead of the card and vice versa.
This Apple website for programmers explains the concepts that support Wallet and how apps can integrate this functionality.