Edit a customer's credit card info

Go to All apps , then Customer Hub, then Customers & leads (Take me there).

Find your customer, select their name, then Edit.

Find the Payments section, then select the current card number below Primary payment method.

Select + Add.

Enter the new card information, then select Save. You'll only see the last 4 digits of the card number.
Intuit performs a quick validation on the card, which may result in the cardholder seeing a $0.00 authorization on their account. If the validation fails, the card won’t be saved.

Select + Create.

Select Sales Receipt or Receive Payment.

Choose the customer, then select the card number below payment method.

Select + Add, enter the new card info, then Save.