What is the name of the application loaded to the MX Series PIN pad when interfaced with a Commander?

The application that is loaded to the MX Series PIN pad when interfaced with a Commander is known as ViperPAY. This application is specifically designed to facilitate transactions and ensure secure payment processing when connected to VeriFone's Commander system. ViperPAY provides functionality suited for a variety of payment types, enhancing the transaction capabilities of the MX Series devices.

Other applications listed, such as PetroPAY and GemPAY, serve different purposes or are tailored for specific industries; however, they are not the default application for interfacing with Commander on the MX Series. VeriPAY is likely another payment application but is distinct from ViperPAY, which is optimized for compatibility and performance with the Commander system. Thus, ViperPAY is the correct and appropriate application to be loaded for such integration.