Yes, you can certainly do that. Here’s how: 

1. Tap the 'Add new' option next to 'Payment method' on the payment page 

2. Choose the debit card or credit card option

3. There are two ways to proceed from here. One is to do it manually, and the other is by scanning your card 

To add a card manually:

i) Enter the name on the card, the card number and its expiry date 

ii) Tap 'Continue' to add your card to the Vault

To scan your card: 

i) Click the scan option on the top right corner of the screen 

ii) Scan the card  

iii) Your details will be auto-filled 

iv) Tap 'Continue' to add your card to the Vault for payments