You can verify payments made by credit card upon entering your security code.
Your security code is a 3- or 4-digit number located in a different place to your credit card number. It is not printed on your card invoice or similar documents.
As no-one else has access to this security code, cardholders can improve security by using it when purchasing flight tickets online.
The security code is a 3-digit number on the signature strip on the reverse of the card.
Depending on the credit card company, it may alternatively be a 4-digit number on the front of the card.