https://support.apple.com/en-us/HT203027

has the ApplePay security and privacy overview. But this ApplePay stuff should likely be in its own thread since it applies to all card users and isn’t really a Centurion thing despite the ability to use a Centurion card with ApplePay and whatever that means in terms of getting Amex MR points for ApplePay purchases, refunded in ways or otherwise.