I want to add new card to my Apple ID

Add a new card or change a card?

You can have a credit card on file and an Apple Account balance.

Your default payment method will be used first by Apple when you need to make a payment.  

If you have set your Apple Account balance as your default payment method and you have a CC, you pay from your default payment method.

If you have 2 CC, and you have set one CC as your default payment method that will be charge by Apple.

See the following Apple articles:

Add a payment method to your Apple ID

Add a payment method to your Apple ID – Apple Support (UK)

• If you want to change your card, you need to add first the new card, then remove the old card.

If you need to change or update your Apple ID payment method

If you need to change or update your Apple ID payment method - Apple Support

If you still need help, get more help and assistant from Apple directly, see Contact Apple for support and service -> Contact Apple for support and service – Apple Support (UK)