Add new Card

Add new Card

How do you add a new credit card to a contact with Zoho API as can be done on web.  I am not able to find way to do this with Books API, CRM API or Subscriptions API.  This is an issue for our company as we do migration from a different system.  I can add card to a subscription through Subscriptions API, but some of our customers may not have a subscription, but only invoices set up in Zoho Books.  Is there any way in Zoho API to add new credit card to contact/customer?