If you are an e-commerce merchant, you must comply with all your local laws, such as all tax acts, trade practices, Sale of Goods (or similar) acts, lemon laws (as applicable), and so on. You should consult a source of legal advice competent for your jurisdiction to find out what is necessary.
If you are a credit card merchant, you have agreed to the credit card merchant agreements. Typically, these are extremely strict about the amounts of fraud allowed, and the guidelines for “card holder not present” transactions. You must read and follow your agreement.
Credit Card Payment