Be wary of letting your card out of your sight when making a transaction, particularly in bars and restaurants, and especially when abroad.

Make sure you know who you are dealing with before disclosing card details. If you are in any doubt undertake additional checks before handing over the details.
Be wary of unprompted phone or email requests asking you to divulge financial details - even if the caller claims to be from the bank or the police.
Card details appear on some receipts so keep them safe or throw them away carefully. Make sure your card details have not been compromised by regularly checking your statements for unfamiliar transactions.
Keep your personal identification number (PIN) secret

Never tell anyone your PIN, even if they claim to be from a bank or the police.
Never write down your PIN and keep it with your card.
If you think someone has discovered your PIN you can change it at a cash machine. You should also notify your card issuer immediately.