Great point of clarity. We made a business decision to only leverage actual APIs from these companies. As a result, our customers are still required to have an official relationship with each PMS they want to integrate with. We have made it a point to not do anything that violates ToS for each of these systems.

While we do possess some insight into how to more easily navigate the business development process with each PMS (and we help our customers do so), we do not help or encourage anyone to circumvent the process altogether.

Without naming specifics, it seems you have identified perhaps one of the more closed systems.