Card registration is easy.

• Open the Wallet on your device
• Select the "+" symbol at the top right and then "next"
• In the next steps you will select the Bank or add another card
• Scan the card or enter its details
• Accept the Terms
• Your details are confirmed by the Bank
• You will receive the secret code on your mobile phone
• Enter the code you have received. Your card is now active in Apple Pay.

If you wish to register more cards with Apple Pay, you will need to repeat the same process for each card on each device.
You can find the instructions for your device in the link.