Yes, you can! To link multiple cards to an account, you must register all cards at the same email address.
This is very easy with the Joyn app:
1. Press ‘Tap to scan QR code’.
2. Scan the QR code of your card.
3. The card is now linked to your account. You can repeat this for all your cards.
Don’t have a smartphone?
1. Go to https://my.joyndev.kinsta.cloud/card-registration
2. Enter your card number and the email address linked to your Joyn account.
3. Choose ‘Confirm’.
4. Open the email ‘Enjoy your new Joyn card’ and press ‘Link your new card’.
5. The card is now linked to your account! You can repeat this for all your cards.