Using the GetGo app:
1. Go to your account.
2. Tap on My payment card details.
3. Tap on Add a new credit/debit card.
4. Input your credit card details.
5. Tap on Save.
Important:
At present, you can save only one credit/debit card to your account. If you wish to switch to another credit/debit card, you will need to delete the existing one before adding the new card.