1.Go to Groups and search for PAYDAY: The Vyse
2.Join that group

Done
Now you should see your masks in game right away
Troubleshooting in case the masks dont show:
Try verifiyng the game cache if the masks just dont want to show up
Or
Wait up one hour for the masks to show
Or if all else fails
start the game, host a random online session, mask up, and shoot around for a few seconds and then back out. Once you back out, you should have the masks in your 'Choose Mask' menu.That should fix most of the disappearing problems -This fix is courtesy of Kyano who was the one to find this