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 "Visa Debit" (if available) or "Visa" as the "card type";
- Enter your debit card number and expiration date in the fields where they are requested;
- If requested, enter the security code in the "Security Code", "CVV2" 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 take you to a final screen where you can confirm all the information you have provided. Then just click "Buy" (or equivalent) and the payment is processed.