Hi @Armaan, welcome to the forum! 
Depending on what we're scanning with the NFC Reader, we may have different data. What we recommend to do is to create a Key Value Component on the mobile app you are working on, and set the "Data" property to the component. Open the app on your phone and all the properties will be populated after scanning the tag. I just tested it with a SF train card and it worked like a charm. I got the "id" and "tech" keys with their respective values under "rawData".
I hope I can still get on the train on my way back home. 
