It's good to have you here in the Community, shroff.
At this time, capturing the customer's credit card info without an associated fee isn't available in QuickBooks Online.
You can follow Klent's recommendation mentioned in the previous reply if you wish the system to retain the credit card information to automatically charge the customer using their credit card details during future payment transactions.
Furthermore, I'm including these articles to assist you in handling your customer's card information in QuickBooks:
If you require further assistance managing customer credit card info or related matters, reply to this thread. I am here to support you at any time.
