How to make game direct2rift compatible

Hi, I’m working on a game for a mall VR kiosk and they seem to be using some sort of old hacked up version of rift software running in extended desktop mode, and all their experiences are built in unity that launch from direct2rift exes. When I try running my game on the PCs it launches like a regular game. The people that run it are vaguely knowledgeable on their setup, which is why I haven’t been told how to make it work. To be honest they haven’t hired me or anything so it’s kind of a weird situation, but I want to make sure that I can build something that they can use before I sign a contract with them. The headsets that they use are pimax 4k, which I received one of their janked up ones from my friend that works for them. Thanks in advanced for any help and for reading my rambling.