Choose what you want to buy and follow the steps:
Click the "Checkout" button (or equivalent) when you want to finalize the purchase;
In the payment information area, select "Credit card" (if available);
Enter your card number and expiration date in the fields where they are requested;
If requested, enter the security code in the "Security Code", "CVV" or "CSC" field. The security code is a three-digit number usually found on the back of your card;
After you verify that all information is correct, complete the transaction. Some sites will ask you an authentication, check the related FAQ: "How does online payment authentication work?"
How can I use Coverflex online?
Edoardo Celestino