When making online purchases with the credit card of your choice, you're usually required to supply your name as shown on the card, your credit card number, expiry date, and a three-digit code that can be found at the back of the card (or in the case of American Express, the four-digit code found in front). Your online purchase will only be processed by the vendor when these details are provided.You should also check that the website you’re on is secure before entering your credit card details at the checkout page. Once you confirm payment, a final approval is usually required via an additional security check. Examples include 2-factor authentication on your mobile phone or a ‘Verified by Visa’ page. You should also keep a copy of your payment confirmation for your reference.