Switching cards
If you’d like your campaigns to be billed to a brand new card, please follow these instructions:
Click Add new payment method and fill in the relevant card fields
Check the Make this card the active, default payment method box
Click Proceed to confirmation and confirm that the information you’ve entered is correct. Click Add this card once you’ve verified the information.
Your card will then go through an approval process. Once we’ve determined that the new card you’ve entered is valid, it will display the Active Card badge. Once this card is active, all your campaigns being billed to a card will be switched over to the new, active card
Deleting a card
In order to delete your card, we require that all campaigns have been paused for more than 48 hours and you do not have an unbilled balance.
To delete your card, click on “Account”, then click on “Payment Methods”
https://business.twitter.com/en/help/account-setup/billing-basics.html