Yes, usually merchants don’t pay attention to the cardholder’s name so you could write anything. However, I’d recommend you to type your name instead of the nine-digit code. We need to improve the app to make totally clear how to use your Mondo card online, so everybody understands how does it work.
Fun fact, online commerce don’t usually check the “start date” either, so if your legacy bank card happens to have “start date” and “exp date” you can leave start date empty and it will work. Yeah yeah, I hear you saying “I’d love to have known that before Mondo, when I needed it” 
Regarding Touch ID to open the app, we’re working on it 