Charging a Customer When We Already Have Their CC on File By Red Lawson | April 2, 2018 | 0 NOTE: CVC numbersĀ are 3 digits with Mastercard, Visa, & Discover. CVC numbers are 4 digits with American Express. Step 1: Charge the customer Step 2: Give them the right tags Posted in Admin, Customer Service, Infusionsoft, Order Handling and tagged cc, credit card, on file, on hand, returning customer Leave a Comment You must be logged in to post a comment.