Get patient credit card by id

A saved credit card on file for a patient, used to charge co-pays, invoices, and other balances without requiring the patient to re-enter card details each time. It stores a reference to the patient, a pointer to the card record held by the external payment processor such as Stripe, and non-sensitive display details like the card issuer, last four digits, and expiration month and year. The actual card number and full payment credentials are never stored here, only in the external payment vendor.