If you’ve disabled cards before, run the command s!enablecards.
To set the points in accounts, use s!setpts.
Finally, if you want to disable cards again, run the command s!disablecards.
Use the command s!newcard.
Afterwards, you can use the commands s!card or s!mycard which check your card balance and other information.
Depending on the store, the way you use that card varies. Ask for details in their server.