Need suggestions - Integration with GloFox. Today one of the customer who runs 3 fitness centers asked if we could integrate with GloFox.

Now, the APIs are for GloFox are not public so it would probably require heavy lifting if possible. But integration will make it easy for us to convert any other Gym who runs on GloFox.
Any contacts with GloFox people? Anyone already integrated?
How do you generally tackle inteegration requests?