On card update, if you would like to collect payment immediately, then you can do so by enabling the "Attempt payment collection when payment method is added" option under Settings >> Configure Chargebee >> Billing Rules (under Billing section). Once you enable this option, payment for the latest unpaid invoice is collected automatically when a payment method is added or updated.

If you have not enabled this option, then you can collect the payment using the Collect Now option under the Actions panel on the Invoice details page. If Dunning is still in progress, then the system will retry using the new card on the next attempt.