Visit https://www.fisglobal.com/cio-mobile and hit the button that reads "Microsoft InTune Company Portal". This lead user to another page in their mobile web browser.
Enter your FIS email address and hit "Next". You will then be asked to decide if you want to "Stay signed in".
Enter your password on the screen with the FIS logo at the top.
After successfully signing in, you will see details on the app. Hit "Install".
Respond to the prompt. Hit "Install" if you would like to begin the install.
The app will appear on your home screen and you will be able to launch it when the install finishes.