I would personally not agree to this. I will pay my provider for each copay at the TOS. I don't want them having my credit card on file. I don't always pay my copay with the same method each time. Sometimes I pay cash, sometimes write a check, use a debit card/credit card, etc. But yes, like Linda said, it is ok with documentation. I just couldn't resist stating I would be looking at him with my eye brows up if he told me he wanted to keep my credit card on file!