Credit card on file

During the PMI talk on 11/19/20, there was a strong recommendation to ensure that patients have a “credit card on file”. Our understanding is that the cardholder has to physically sign a form to allow us to maintain their credit card number in our system.
With many patients not coming to the office that will make the process much more difficult.
Is there some method to put a credit card on file remotely?

We utilize card on file functionality. Billing staff takes and enters the credit card information into the patient’s chart. A form is printed and mailed (or mailed) to the patient to sign and return to the office. If the signed form is not received in 7-10 business days, members of the Billing team follow up with patient.