Capturing zip code

For increased fraud protection i would like to enable Zip code check on Stripe radar.
But it does not look like the plugin is recording the zip code, as you can see in this screenshot – https://www.dropbox.com/s/vtsdtjo09pg5k6j/Screenshot%202019-04-21%2006.43.05.png

How can i get it to record the zip code as well

The page I need help with: [log in to see the link]