How to use MST without Samsung Pay?

[Android Central Question]

I have an SM-G891A. I want to be able to add ANY card with a magnetic strip to work with my phone's MST feature. For example, add an access card used to enter a building so I don't have to carry the access card around. Then I would never have to take my wallet with me.

I am happy to root my phone if it means that I can use MST with any magnetic-strip card I want.