Different Options to Identify Players in POS

We have several players with similar names. While player IDs are unique and are a great way to differentiate, not everyone knows their player number. 

A few options: 
1. Profile Picture
- The ability to see a player's picture at the POS to verify the person charging to the account.
2. Changing the player ID to something identifiable 
- Email?
3. Notes
- Nicknames