How secure is Apple Pay?
Apple Pay is a very secure way to make payments. That's because your card numbers are not stored on your device and are never shared by Apple Pay or sent with your payment. Instead Apple Pay gives you a unique Device Account Number that's encrypted and stored in a secure part of your iPhone, iPad or Apple Watch. So when you use Apple Pay, your Device Account Number and a specially created security code are used to process your payment.
Just make sure you keep your card protected by:
• choosing a device passcode that no-one else knows or could guess easily
• storing your fingerprint within Apply Pay – don't store anyone else's fingerprint